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Astronomer - Blog Posts
Gobble Up These Black (Hole) Friday Deals!
Welcome to our 6th annual annual Black Hole Friday! Check out these black hole deals from the past year as you prepare to head out for a shopping spree or hunker down at home to avoid the crowds.
First things first, black holes have one basic rule: They are so incredibly dense that to escape their surface you’d have to travel faster than light. But light speed is the cosmic speed limit . . . so nothing can escape a black hole’s surface!
Black hole birth announcements
Some black holes form when a very large star dies in a supernova explosion and collapses into a superdense object. This is even more jam-packed than the crowds at your local mall — imagine an object 10 times more massive than the Sun squeezed into a sphere with the diameter of New York City!
Some of these collapsing stars also signal their destruction with a huge burst of gamma rays. Our Fermi Gamma-ray Space Telescope and Neil Gehrels Swift Observatory continuously seek out the signals of these gamma ray bursts — black hole birth announcements that come to us from across the universe.
NICER black holes
There are loads of stellar mass black holes, which are just a few 10s of times the Sun’s mass, in our home galaxy alone — maybe even hundreds of millions of them! Our Neutron Star Interior Composition Explorer, or NICER for short, experiment on the International Space Station has been studying some of those relatively nearby black holes.
Near one black hole called GRS 1915+105, NICER found disk winds — fast streams of gas created by heat or pressure. Scientists are still figuring out some puzzles about these types of wind. Where do they come from, for example? And do they change the way material falls into the black hole? Every new example of these disk winds helps astronomers get closer to answering those questions.
Merging monster black holes
But stellar mass black holes aren’t the only ones out there. At the center of nearly every large galaxy lies a supermassive black hole — one with the mass of millions or billions of Suns smooshed into a region no bigger than our solar system.
There’s still some debate about how these monsters form, but astronomers agree that they certainly can collide and combine when their host galaxies collide and combine. Those black holes will have a lot of gas and dust around them. As that material is pulled into the black hole it will heat up due to friction and other forces, causing it to emit light. A group of scientists wondered what light it would produce and created this mesmerizing visualization showing that most of the light produced around these two black holes is UV or X-ray light. We can’t see those wavelengths with our own eyes, but many telescopes can. Models like this could help scientists know what to look for to spot a merger.
Black holes power bright gamma ray lights
It also turns out that these supermassive black holes are the source of some of the brightest objects in the gamma ray sky! In a type of galaxy called active galactic nuclei (also called “AGN” for short) the central black hole is surrounded by a disk of gas and dust that’s constantly falling into the black hole.
But not only that, some of those AGN have jets of energetic particles that are shooting out from near the black hole at nearly the speed of light! Scientists are studying these jets to try to understand how black holes — which pull everything in with their huge amounts of gravity — provide the energy needed to propel the particles in these jets. If that jet is pointed directly at us, it can appear super-bright in gamma rays and we call it a blazar. These blazars make up more than half of the sources our Fermi space telescope sees.
Catching particles from near a black hole
Sometimes scientists get a two-for-one kind of deal when they’re looking for black holes. Our colleagues at the IceCube Neutrino Observatory actually caught a particle from a blazar 4 billion light-years away. IceCube lies a mile under the ice in Antarctica and uses the ice itself to detect neutrinos, tiny speedy particles that weigh almost nothing and rarely interact with anything. When IceCube caught a super-high-energy neutrino and traced its origin to a specific area of the sky, they turned to the astronomical community to pinpoint the source.
Our Fermi spacecraft scans the entire sky about every three hours and for months it had observed a blazar producing more gamma rays than usual. Flaring is a common characteristic in blazars, so this didn’t attract special attention. But when the alert from IceCube came through, scientists realized the neutrino and the gamma rays came from the same patch of sky! This method of using two or more kinds of signals to learn about one event or object is called multimessenger astronomy, and it’s helping us learn a lot about the universe.
Get more fun facts and information about black holes HERE and follow us on social media today for other cool facts and findings about black holes!
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10 Things: Mysterious 'Oumuamua
The interstellar object 'Oumuamua perplexed scientists in October 2017 as it whipped past Earth at an unusually high speed. This mysterious visitor is the first object ever seen in our solar system that is known to have originated elsewhere. Here are five things we know and five things we don’t know about the first confirmed interstellar object to pass through our solar system.
1. We know it’s not from around here.
The object known as 1I/2017 U1 (and nicknamed ‘Oumuamua) was traveling too fast (196,000 mph, that’s 54 miles per second or 87.3 kilometers per second) to have originated in our solar system. Comets and asteroids from within our solar system move at a slower speed, typically an average of 12 miles per second (19 kilometers per second) . In non-technical terms, 'Oumuamua is an “interstellar vagabond.”
Artist impression of the interstellar object ‘Oumuamua. Credit: ESA/Hubble, NASA, ESO, M. Kornmesser
2. We’re not sure where it came from.
'Oumuamua entered our solar system from the rough direction of the constellation Lyra, but it’s impossible to tell where it originally came from. Thousands of years ago, when 'Oumuamua started to wander from its parent planetary system, the stars were in a different position so it’s impossible to pinpoint its point of origin. It could have been wandering the galaxy for billions of years.
3. We know it’s out of here.
'Oumuamua is headed back out of our solar system and won’t be coming back. It’s rapidly headed in the direction of the constellation Pegasus and will cross the orbit of Neptune in about four years and cover one light year’s distance in about 11,000 years.
4. We don’t really know what it looks like.
We’ve only seen it as a speck of light through a telescope (it is far away and less than half a mile in length), but its unique rotation leads us to believe that it’s elongated like a cigar, about 10 times longer than it is wide. We can’t see it anymore. Artist’s concepts are the best guesses at what it might look like.
5. We know it got a little speed boost.
A rapid response observing campaign allowed us to watch as 'Oumuamua got an unexpected boost in speed. The acceleration slightly changed its course from earlier predictions.
“This additional subtle force on ′Oumuamua likely is caused by jets of gaseous material expelled from its surface,” said Davide Farnocchia of the Center for Near Earth Object Studies (CNEOS) at NASA’s Jet Propulsion Laboratory. “This same kind of outgassing affects the motion of many comets in our solar system.”
6. We know it’s tumbling.
Unusual variations in the comet’s brightness suggest it is rotating on more than one axis.
This illustration shows ‘Oumuamua racing toward the outskirts of our solar system. As the complex rotation of the object makes it difficult to determine the exact shape, there are many models of what it could look like. Credits: NASA/ESA/STScI
7. We don’t know what it’s made of.
Comets in our solar system kick off lots of dust and gas when they get close to the Sun, but 'Oumuamua did not, which led observers to consider defining it as an asteroid.
Karen Meech, an astronomer at the University of Hawaii’s Institute of Astronomy, said small dust grains, present on the surface of most comets, may have eroded away during ′Oumuamua's long journey through interstellar space. "The more we study ′Oumuamua, the more exciting it gets." she said. It could be giving off gases that are harder to see than dust, but it’s impossible to know at this point.
8. We knew to expect it.
Just not when. The discovery of an interstellar object has been anticipated for decades. The space between the stars probably has billions and billions of asteroids and comets roaming around independently. Scientists understood that inevitably, some of these small bodies would enter our own solar system. This interstellar visit by ‘Oumuamua reinforces our models of how planetary systems form.
9. We don’t know what it’s doing now.
After January 2018, 'Oumuamua was no longer visible to telescopes, even in space. But scientists continue to analyze the data gathered during the international observing campaign and crack open more mysteries about this unique interstellar visitor.
10. We know there’s a good chance we’ll see another one...eventually.
Because ′Oumuamua is the first interstellar object ever observed in our solar system, researchers caution that it’s difficult to draw general conclusions about this newly-discovered class of celestial bodies. Observations point to the possibility that other star systems regularly eject small comet-like objects and there should be more of them drifting among the stars. Future ground- and space-based surveys could detect more of these interstellar vagabonds, providing a larger sample for scientists to analyze. Adds, Karen Meech, an astronomer at the University of Hawaii’s Institute of Astronomy: “I can hardly wait for the next interstellar object!"
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Vera Rubin, the woman who discovered the first evidence of dark matter, has died at 88
Vera Rubin, the astrophysicist responsible for confirming the first existence of dark matter, died on Sunday night at the age of 88.
Carnegie Institution president Matthew Scott called Rubin “a national treasure as an accomplished astronomer and a wonderful role model for young scientist.”
Rubin and her colleagues observed galaxies in the 1970s, they learned the motion of stars is a result of a “material that does not emit light and extends beyond the optical galaxy” — also known as dark matter.
Swiss astrophysicist Fritz Zwicky proposed the idea of dark matter in 1933, but Rubin’s groundbreaking work subsequently led to the confirmation of the material.
This finding is what led to the discovery that 90% of the universe is made up of dark matter, a finding some colleagues felt was overlooked and deserving of a Nobel Prize. Read more
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International Asteroid Day aims to raise public awareness about the asteroid impact hazard and to inform the public about the crisis communication actions to be taken at the global level in case of a credible near-Earth object threat. . . . . . . #asteroid #universe #space #spacetime #astronomy #astronomer #spacestation #spacetravel #sunrise #satellite https://www.instagram.com/p/CCDuhL2DN0Z/?igshid=5vxzze8zzajg
drawing The Astronomer (ghost） pencil,ink,acrylic colored pencil,marker pen,on paper 81.5cm×66cm 2017
Which one do you want to watch? 😍 • Follow @_space___lover_ for More Amazing Stuff About Space & Science 🚀 • Follow @_space___lover_ 🛰 Follow @_space___lover_ 🛰 • • Share with your friends ! 📲 • Hashtags 📊 #curiosityofspace #nebula #space #cosmology #scifi #spacex #curiosity #spacememes #astronomer #astronomy #wormholes #universe #astronomie #astronomyphotography #astrophotography #spacetime #astronomical #astronomyphotos #spacefacts #spacetoday #cosmos #cosmology #interstellar #deepspace #spaceexploration #deepsky https://www.instagram.com/p/CCakePgnSFW/?igshid=1gmceqp2xku86
Star trails 🌠 Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology https://www.instagram.com/p/CDfo7xMjZEW/?igshid=1ux6s59m74unr
The famous eagle aurora 💯🔥 Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #aurora https://www.instagram.com/p/CDeUQFpDef6/?igshid=850hd4voqe7m
Coolest and creative animation of space travel 💯 Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDdLaJCj0bN/?igshid=1roj7yjw1j2og
Swipe left ➡️ 2 planets, one star and a comet all lying in the same plane 💯🔥. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDb1WISDOpl/?igshid=1m297vhjh67zc
VTOL - Vertical Take off and Landing of an Aircraft. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #vtol #vtolaircraft #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology https://www.instagram.com/p/CDaTp7sDd6D/?igshid=1ordj32jbdabu
Once in a blue moon on the arc of a tree. Follow us for more interesting updates on @the_astrophysics_forum . Does an alignment like this occur only once in a blue moon? No, although it was during a blue moon that this single-shot image was taken. During a full moon that happened to be the second of the month -- the situation that defines a blue moon -- the photographer created the juxtaposition in late January by quickly moving around to find just the right spot to get the background Moon superposed behind the arc of a foreground tree. Unfortunately, in this case, there seemed no other way than getting bogged down in mud and resting the camera on a barbed-wire fence. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDZKtTkD57R/?igshid=wpnuzj6643qe
Sand dunes on gale crater of mars. Follow us for more interesting updates @the_astrophysics_forum . A new type of dune, called “wind-drag ripples,” found last year by the Curiosity rover in Gale Crater. The dune is a part of the Bagnold Dune Field, on the the northwestern flank of Mount Sharp. The images were taken in early morning, with the camera looking in the direction of the sun. This mosaic combining the images has been processed to brighten it and make the ripples more visible. The sand is very dark, both from the morning shadows and from the intrinsic darkness of the basaltic minerals that dominate its composition. The base of Mount Sharp can be seen beyond the dunes. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem (at Mars) https://www.instagram.com/p/CDYLFTFDhfL/?igshid=jlnn7ii4i22f
Escatic timelapse of our milkyway galaxy containing plethora of stars in the sky from the waters. Do follow us for interesting updates @the_astrophysics_forum . Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDWeDLyDE89/?igshid=1uh54ldpzzih7
Psyche it is ! Follow us to explore more with us @the_astrophysics_forum .⬇️ The Psyche mission is a journey to a unique metal asteroid orbiting the Sun between Mars and Jupiter. What makes the asteroid Psyche unique is that it appears to be the exposed nickel-iron core of an early planet, one of the building blocks of our solar system. Deep within rocky, terrestrial planets - including Earth - scientists infer the presence of metallic cores, but these lie unreachably far below the planets' rocky mantles and crusts. Because we cannot see or measure Earth's core directly, Psyche offers a unique window into the violent history of collisions and accretion that created terrestrial planets. The mission is led by Arizona State University. NASA's Jet Propulsion Laboratory is responsible for mission management, operations and navigation. The spacecraft's solar-electric propulsion chassis will be built by Maxar (formerly SSL) with a payload that includes an imager, magnetometer, and a gamma-ray spectrometer. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #psyche #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #jupiter #science #astronaut #planets #astrophysics #cosmology #solarsystem https://www.instagram.com/p/CDTn8J0DvdG/?igshid=jg42dzpqix7c
Watch this interesting simulation about the mysteries of the universe 😍💯. Space continues raising more and questions to the humanity with many of them yet remaining unanswered. The Universe has phenomena that people might be unable to explain. ⠀ 👽 Is there life on Mars? 💫 Is it possible to overcome the speed of light? 🌌 Where is the edge of the Universe and how fast one can reach it? ☄ What is inside a black hole? Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDS9PpfjHAn/?igshid=12ir2xn53k9gk
SWIPE FOR MORE ➡️ NASA’s Mars 2020 Perseverance rover lifted off successfully today, July 30, at 7:50 a.m. EDT (1150 GMT) aboard a United Launch Alliance Atlas V rocket from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida. follow us to explore more at @the_astrophysics_forum . The rover will take about seven months to travel to the Red Planet and, on Feb. 18, 2021, will land in Mars' Jezero Crater to search for signs of life, explore the planet's geology and much more. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #perserverance #mars2020 #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology (at Cape Canaveral NASA) https://www.instagram.com/p/CDRKB0ND3R0/?igshid=suds0lgn488y
Radhika Lakhani and Vaidehi Vekariya, both studying in 10th grade, were working on a school project when they discovered the asteroid, which they named HLV2514. Follow us to explore more with us @the_astrophysics_forum . The girls, from the city of Surat in the western Indian state of Gujarat, were participating in a Space India and NASA project, which allows students to analyze images taken by a telescope positioned at the University of Hawaii. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDP4Y3Fjy8e/?igshid=1vvuug3d8zw9e
Beautiful 24 hour timelapse of the Fall Equinox. Wait for it till the end 💯. Follow us to explore more with us @the_astrophysics_forum . Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDOsgeKDMgD/?igshid=5n0xpt0nldi2
The Dragon V2, designed to be an reusable spacecraft able to transport astronauts into space and back to Earth. A SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft is launched from Launch Complex 39A on NASA's SpaceX Demo-2 mission to the International Space Station with NASA astronauts Robert Behnken and Douglas Hurley onboard, Saturday, May 30, 2020, at NASA's Kennedy Space Center in Florida. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #falcon9 #launchamerica #crewdragon #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics https://www.instagram.com/p/CDNtHF3j_yl/?igshid=1bmhtlw9cyxd5
Glorious and gigantic Jupiter from juno probe. Follow us to explore more with us @the_astrophysics_forum . The Juno mission has the potential to be very, very significant because it won’t just tell us more about Jupiter (which is worthy enough on its own), it will tell us more about the formation of the solar system. As the largest item in the solar system (other than the Sun, of course), Jupiter is the place to look to gain understanding of the primordial solar system. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #jupiter #juno #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earth #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDLurcLjw2p/?igshid=x7fzj9nhojbe
Why would clouds form a hexagon on Saturn? Follow us to explore more with us @the_astrophysics_forum. Nobody is sure. Originally discovered during the Voyager flybys of Saturn in the 1980s, nobody has ever seen anything like it anywhere else in the Solar System. Acquiring its first sunlit views of far northern Saturn in late 2012, the Cassini spacecraft's wide-angle camera recorded this stunning, false-color image of the ringed planet's north pole. The composite of near-infrared image data results in red hues for low clouds and green for high ones, giving the Saturnian cloudscape a vivid appearance. This and similar images show the stability of the hexagon even 20+ years after Voyager. Movies of Saturn's North Pole show the cloud structure maintaining its hexagonal structure while rotating. Unlike individual clouds appearing like a hexagon on Earth, the Saturn cloud pattern appears to have six well defined sides of nearly equal length. Four Earths could fit inside the hexagon. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #saturn #saturnhexagon #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDK5eXgjVPs/?igshid=ponilu3snxkk
Today, 27th July is celebrated as APJ Abdul Kalam's Memorial Day. Your contribution towards development of the nation cannot be forgotten ever. We'll miss you sir❤️. An inspiration to billions of people around the world. "If you fail, never give up because FAIL means "First Attempt In Learning" ~ APJ. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #apjabdulkalam #apj #apjabdulkalamquotes #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics https://www.instagram.com/p/CDI4ZG7DiAa/?igshid=1s0i35oxxyzzc
We would've seen many more space exploration and probably ones like in interstellar and Martian movies as well xD. Follow us to explore more @the_astrophysics_forum. Tighten your seatbelts and get ready to explore endless universe 🚀 Make sure you follow us @the_astrophysics_forum To stay on board 👨🚀 . . . . . . . #spacex #elonmusk #space #nasa #isro #universetoday #universe #hubbletelescope #hubble #milkywaychasers #milkyway #spacetime #spaceexploration #spacetravel #deepspace #astronomy #neildegrassetyson #astronomer #blackhole #earthday #earth #mars #galaxy #science #astronaut #planets #astrophysics #cosmology #nebula #solarsystem https://www.instagram.com/p/CDIX8IkjlVw/?igshid=rcdivh9lqkqb
Dr. Moon
1st drawing on my laptop using fire alpaca. First time drawing with a pen and lemme tell you pen sensitivity and pressure is really cool to work with.
anyways this is Dr. Moon a young geeky astronomer. He works mainly with planets.
hope you enjoy
I’m back! July was nuts! June was also nuts! I’ve missed this podcast, though, and have been thinking about it the entire time because I will never stop loving space. I was working my way through a very meaty book on Edmond Halley and I am here to report on my findings, and also compile some of the things I’ve already said about this cool guy and his cool contributions to science.
Below the cut are my standard glossary, transcript, timeline of people mentioned, sources, and music credits. I take topic suggestions from Tumblr messages, you can tweet at me on Twitter at @HDandtheVoid, or you can ask me to my face if you know me. Subscribe on iTunes to get the new episodes of my increasingly erratically updated podcast, and please please please rate and review it. Go ahead and tell friends if you think they’d like to hear it, too!
(My thoughts on the next episode are Stephen Hawking and his theories or famous comets. The next episode will go up in August—hopefully August 20th!)
Glossary
sidereal year—the time required for the earth to complete an orbit of the sun relative to the stars.
tropical year—the interval at which seasons repeat and the basis for the calendar year.
Script/Transcript
Timeline
Julius Caesar, Roman (100-45 BCE)
Augustus Caesar, Roman (63-14 BCE)
Nicolaus Copernicus, Polish (1473-1543)
Pope Gregory XIII, Italian (1502-1585)
Tycho Brahe, Danish (1546-1601)
Johannes Kepler, German (1571-1630)
Johannes Hevelius, Polish (1611-1687)
Giovanni Cassini (in French, Jean-Dominique Cassini), Italian/French (1625-1712)
Queen Christina, Swedish (1626-1689)
Isaac Newton, English (1643-1727)
John Flamsteed, English (1646-1719)
Elisabeth Hevelius, Polish (1647-1693)
Edmond Halley, English (1656-1742)
John Harrison, English (1693-1776)
Sources
Morse, Stephen P. “The Julian Calendar and why we need to know about it.” The Association of Professional Genealogists Quarterly (March 2014). Accessed July 15, 2018.
Julian Date Converter via the Astronomical Applications Department of the U.S. Naval Observatory.
Hughes, David W. “Edmond Halley, Scientist.” British Astronomical Association (1985). Accessed July 27, 2018.
Cook, Alan. Edmond Halley: Charting the Heavens and the Seas. Clarendon Press: Oxford, 1998.
Intro Music: ‘Better Times Will Come’ by No Luck Club off their album Prosperity
Outro Music: ‘Fields of Russia’ by Mutefish off their album On Draught
