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	2022-10-12: The REAL Possibility of Mapping Alien Planets! 06:05: ... orbital radius. Around 550 “astronomical  units” or “AUs” in astronomer-speak.   For comparison, Voyager 1 is our most distant probe. It’s ... 07:45: ... the destination during the working lifetime of at least some of the astronomers   and engineers who witness the launch we need a travel time of 25-30 ...
	2022-09-21: Science of the James Webb Telescope Explained! 00:07: But why should astronomers have all the fun? 01:26: You don’t have to be employed by NASA, or a US citizen, or even a professional astronomer. 09:03: Many astronomers did a lot of science with this one image. 10:33: OK, so that’s a primer on what JWST can do and how astronomers use it.
	2022-05-25: The Evolution of the Modern Milky Way Galaxy 00:00: ... Desert in Chile. I was  traveling with a much more experienced astronomer   from Europe, but it was also his first time in  the southern ... 06:32: ... has  told us so far. A lot, actually. For example,   astronomers have identified the last truly  gigantic merger that happened to ... 06:57: ... enables the telescope to detect tiny motions,  which in turn allows astronomers to reconstruct   detailed orbits of Milky Way stars. The stars ... 10:12: ... the littlest ones are still close together so it’s   easy for astronomers to pick out the little stripe  of stars, like GD-1: a globular ...
	2022-05-18: What If the Galactic Habitable Zone LIMITS Intelligent Life? 02:06: ... a modern astronomer’s perspective,  our Sun is objectively mediocre,   average ... 05:52: ... content of a cloud   or a star. It comes from the fact that astronomers  tend to call any element heavier than helium   a metal. On the ...
	2022-04-20: Does the Universe Create Itself? 10:30: ... other side of the U. An eyeball here symbolizes the observer. All the astronomers with their telescopes and observatories are aimed back at the Big ...
	2022-03-23: Where Is The Center of The Universe? 00:37: Ever since then, astronomers have embraced the Copernican principle, which states that we are NOT in a special place in the universe. 18:31: ... astronomer Sofia Sheikh found around 60 similar signals that were not clearly ...
	2022-03-08: Is the Proxima System Our Best Hope For Another Earth? 01:28: ... telescope thing improved over the next century and a half, allowing astronomers to watch alpha-cen sway relative to the background stars as Earth ... 03:50: In 2016, Spanish astronomer Guillem Anglada-Escudé  and the Pale Red Dot team figured it out: Proxima had a planet. 06:50: ... between exoplanet and star combined with the speed of the wobble, astronomers could calculate its ...
	2022-02-10: The Nature of Space and Time AMA 00:03: ... in a sense uh that's a that's a pretty valid way to think about now astronomers don't like to think about the expansion of the universe as of objects ...
	2022-01-19: How To Build The Universe in a Computer 01:26: ... 1941 the Swedish astronomer Erik Holmberg  conducted what was probably the first simulation of ...
	2021-12-29: How to Find ALIEN Dyson Spheres 09:46: ... Jugaku and Shiro Nishimura, Japanese astronomers who’ve been searching for Dyson spheres for years, calculate that a ... 10:01: ... search has expanded massively. One of the latest efforts led by Swedish astronomer Erik Zackrisson looked at over 200,000 of the stars in the gigantic ... 12:33: ... this possibility in mind, a team led by Penn State astronomer Jason Write used the WISE survey to look for galaxies that had too much ...
	2021-12-20: What Happens If A Black Hole Hits Earth? 02:27: ... supermassive black holes in the centers of galaxies. Over the decades, astronomers and cosmologists have managed to systematically rule out most of the ... 03:25: ... distant stars strongly enough to easily spot them. But fortunately for astronomers, and perhaps less fortunate for everyone else - if dark matter really is ...
	2021-12-10: 2021 End of Year AMA! 00:02: ... to win control of the show [Music] long story short every single astronomer in the world was inspired by carl sagan and thinks that the duty of ...
	2021-11-10: What If Our Understanding of Gravity Is Wrong? 01:39: ... for nearly as long as astronomers have been hunting for dark matter, others have been hunting for an ...
	2021-09-15: Neutron Stars: The Most Extreme Objects in the Universe 10:06: ... of the neutron star’s rotation-   and gravitational wave astronomers are searching for these signals with LIGO right now, ...
	2021-09-07: First Detection of Light from Behind a Black Hole 00:07: Our cleverest astronomers have figured out ways to catch light that skims the very edge of black holes. 01:59: ... telescope - it can be done with a single, ordinary scope, and one astronomer with lots of ... 05:46: ... of the quasar spectrum, and one that confused the hell out of the astronomers who first saw ...
	2021-08-03: How An Extreme New Star Could Change All Cosmology 00:47: ... that go bump in the night - astrophysical objects that vary over time. Astronomers using the ZTF caught a white dwarf that, at first glance, looked ... 02:51: ... so the mystery deepens. At this point, astronomers decided that the object was weird enough to bring some serious firepower ... 03:58: ... telescope cameras see them as single points of light. But astronomers have a clever trick. If you know how much light a star is churning out - ...
	2021-07-21: How Magnetism Shapes The Universe 05:51: Fortunately astronomers are also tricky, and so have tricks.
	2021-05-11: How To Know If It's Aliens 05:11: ... brings us to Venus. In September 2020 Astronomers reported the signature of phosphine in the upper atmosphere of Venus ... 09:58: ... a pair of comets were in the radio beam at the time, but the Ohio State astronomers insist that those comets were not in the beam at all. No other ... 13:52: ... to reveal to you the true secrets of all those alien communications that astronomers have been hiding from the public for years. We'll then introduce some ...
	2021-03-16: The NEW Crisis in Cosmology 01:16: ... throwing galaxies apart from  each other. We’ve talked about how astronomers   first figured this out. Long story short  - when a distant galaxy’s ... 03:13: ... beyond a certain distance. In the 1990s two teams of astronomers employed a new type of   standard candle - the incredibly ... 04:42: ... different teams of astronomers pursued both approaches - and this is where the crisis   ...
	2021-02-24: Does Time Cause Gravity? 07:48: But light DOES bend in a gravitational field - astronomers see it happening all the time in the effect we call gravitational lensing.
	2020-10-27: How The Penrose Singularity Theorem Predicts The End of Space Time 00:00: ... holes. Generally speaking.   Specifically it was shared by the astronomers who revealed  to us the Milky Way’s central black hole and by ... 12:11: ... stars in the galactic core. The work of Ghez and Genzel and other astronomers   have guaranteed the existence of black holes, which means their are ...
	2020-09-01: How Do We Know What Stars Are Made Of? 01:13: And a lot of it was thanks to a brilliant young astronomer named Cecilia Payne.
	2020-08-17: How Stars Destroy Each Other 01:39: There, the royal astronomers of King Sejong’s court in Korea recorded a new point of light in the constellation of Wei, in what we call Scorpius. 02:28: ... our newfangled giant telescopes at the same spot where the royal Korean astronomers saw their guest star … you see ... 03:57: That placed it exactly where those royal astronomers saw their classical nova.
	2020-06-15: What Happens After the Universe Ends? 15:01: ... of the next Universe to continue your glory and to seriously confuse the astronomers of the next ...
	2020-05-11: How Luminiferous Aether Led to Relativity 13:52: ... week we explored how it is that astronomers could possibly calculate the age of the universe, given that we don't ... 16:48: ... character. The funny thing is, Slipher wasn't even some fancy European astronomer. He was from Indiana. His brother's name was Earl. I'd say that maybe ...
	2020-05-04: How We Know The Universe is Ancient 00:17: ... see the same constellations on the night sky as did our astronomer ancestors. Familiar star-maps are recorded in cave paintings tens of ... 01:35: ... the beginning of the 20th century, astronomers were arguing about the nature of these faint, fuzzy patches of light on ... 03:24: ... once been in an extremely hot, dense state, and expanded from there. Astronomers call this the big bang model of the universe. Now the name “big bang” ... 06:22: ... In the near-century since Edwin Hubble’s great discovery, thousands of astronomers have devoted their lives to measuring the Hubble constant - and a big ... 07:07: ... when astronomers did this calculation in the early 1930s, they figured that the universe ... 08:58: ... the next step in improving this number, I need to explain another method astronomers had been using to get distances to galaxies, and so calculate the Hubble ... 09:39: ... astronomers had originally made an awkward mistake - they had been counting bright ... 11:07: ... on the whole universe. It was in an attempt to do the latter that astronomers discovered the anti-gravitational effect of dark energy, and had to ...
	2020-04-14: Was the Milky Way a Quasar? 02:19: ... start in 2010, when a team of astronomers from the Harvard-Smithsonian Centre for Astrophysics were using the ... 02:33: ... astronomers believe that when dark matter particles crash into and annihilate each ... 06:36: Believe it or not, it’s not so uncommon for astronomers to witness storms of supernova explosions raging across a galaxy. 10:51: ... a result published last year in Nature, a team of astronomers using South Africa’s MeerKAT telescope array discovered a handful of ... 11:25: ... 1400 light years above and below the plane of the Galaxy — leading astronomers to believe that they might be younger, more recent versions of the ... 12:47: ... a paper posted last month, a team of astronomers presented evidence that the X-ray activity of our central black hole has ...
	2020-04-07: How We Know The Earth Is Ancient 04:32: ... that earth was just one planet among several in our solar system. Astronomers now swear by the Copernican principle - Earth is not in a privileged ... 10:35: ... old, based on his radiometric dating. This was around the same time that astronomers proved that Immanuel Kant’s Island Universes were indeed other galaxies, ...
	2019-12-09: The Doomsday Argument 03:31: ... his estimate of the cosmological constant to be the value that most astronomers across the multiverse would observe, with a few assumptions like that ... 08:39: ... case the question was “what sort of cosmological constant is the typical astronomer likely to observe - so reference class was an astronomer - or really any ...
	2019-11-11: Does Life Need a Multiverse to Exist? 08:45: ... existence of dark energy was discovered in the 90s as astronomers tried to measure the expansion rate of the universe, only to find that ...
	2019-10-07: Black Hole Harmonics 11:42: LIGO has a publicly available alert system so that astronomers can follow up gravitational wave detections with other telescopes.
	2019-09-30: How Many Universes Are There? 15:37: ... it should have been planetary scientists that made this decision, not astronomers. ...
	2019-09-23: Is Pluto a Planet? 00:56: Astronomers are all about space taxonomy. 01:36: If you were an ancient astronomer like say, Ptolemy, the planets were the asteres planetai, the wandering stars. 03:52: But astronomers kept finding more and more objects in that vicinity, and eventually realized that a new group was needed in our taxonomy. 05:00: ... Planet X became the grail quest of Percival Lowell, businessman turned astronomer. He built the Lowell Observatory in Arizona with that single ... 05:48: ... Astronomer’s were expecting a planet - and one was found roughly where they thought ... 06:15: By 1931, astronomers had figured out that there didn’t need to be a ninth planet to account for Uranus’s strange orbit. 08:35: And so, despite the anger of schoolchildren everywhere, it was in their own interests that astronomers decided to act. 13:33: Maybe at some point in the future, as we learn more about how different worlds form, astronomers will change the definition of planet again.
	2019-08-19: What Happened Before the Big Bang? 10:47: Lemaitre was a Jesuit priest and astronomer physicist.
	2019-07-25: Deciphering The Vast Scale of the Universe 02:05: ... 1915, the American astronomer Vesto Slipher reported that some of those fuzzy blobs were zipping away ... 03:34: Not likely – at least not until the brilliant work of astronomer Henrietta Leavitt.
	2019-06-20: The Quasar from The Beginning of Time 00:40: ... 4,200 meters, the oxygen up here is 60% sea level, but astronomers deal with it because it is the premier astronomical observing site in ... 00:53: To Hawaiians it is a sacred site. And to astronomers, it's where the Earth meets the universe. 01:38: ... here to talk about a very special observation. In the spring of 2017, astronomers turned Gemini's great mirror towards the constellation of Boötes, the ... 01:50: ... of light that had been noticed in one of our great surveys of the sky. Astronomers guessed the speck was a quasar - a vortex of radiant matter falling into ... 02:06: ... was strange about this one was its distance. Its light was SO red that astronomers realized that that light must have been stretched out – redshifted – by ...
	2019-06-17: How Black Holes Kill Galaxies 07:21: ... in killing star formation they are accomplices to the crime but many astronomers think Supermassive Black holes are the main suspect here's one final ...
	2019-04-24: No Dark Matter = Proof of Dark Matter? 00:03: ... unseen origin was holding them together since the 1970s generations of astronomers have searched for the origin of dark matter gradually ruling out the ...
	2019-04-03: The Edge of an Infinite Universe 03:00: In general relativity we call a universe with this geometry de Sitter space, after Dutch astronomer Willem de Sitter.
	2019-03-20: Is Dark Energy Getting Stronger? 01:34: Back in the late 90s two teams of astronomers accidentally discovered dark energy.
	2019-03-06: The Impossibility of Perpetual Motion Machines 13:33: Francois Lacombe asks how astronomers distinguish the very small temperature differences in the CMB from the rest of the microwave noise.
	2019-01-24: The Crisis in Cosmology 00:07: ...has consumed astronomers for generations. 01:37: ...of thousands of astronomers across the generations. 04:59: ...astronomers were using these supernovae to better nail down the Hubble constant.
	2019-01-09: Are Dark Matter And Dark Energy The Same? 00:03: Astronomers are the worst at naming things. 00:10: But perhaps one astronomer has just fixed it, with a theory that says perhaps actually they are they same stuff.
	2018-12-06: Did Life on Earth Come from Space? 00:37: ... the interstellar space rock boom or more and the proposition by some astronomers that it may be an alien light sail I laid out the case why this is very ...
	2018-10-25: Will We Ever Find Alien Life? 05:33: A team of astronomers scoured the GAIA data looking for stars that were unusually faint for their stellar type. 07:05: Give astronomers data and they will write papers. 08:12: Astronomers Adam Frank and W.T. Sullivan did this in 2015.
	2018-10-03: How to Detect Extra Dimensions 05:48: But you restrict all the other stuff in the universe-- matter, radiation, astronomers-- to only three spatial dimensions.
	2018-08-30: Is There Life on Mars? 03:00: Astronomer Giacomo Maraldi quickly followed Huygens and in the early-18th century discovered ice caps on both poles, correctly inferring their nature. 03:27: ... Herschel was a fantastic astronomer, but his wrongness about Mars's atmosphere is a nice example that even ...
	2018-08-01: How Close To The Sun Can Humanity Get? 02:07: ... coronal mass ejection, dubbed the Carrington Event, after British astronomer Richard Carrington who observed ...
	2018-05-09: How Gaia Changed Astronomy Forever 05:34: ... Astronomers have already found evidence in the Gaia data that our galaxy was ... 09:00: Astronomers are not the most imaginative at namings stuff.
	2018-03-28: The Andromeda-Milky Way Collision 03:09: Those velocities were found by another astronomer, Vesto Slipher, by measuring Doppler shifts of spectral lines. 08:56: Astronomers in the distant future will see only a single featureless orb in the sky, and the next nearest galaxies will be very far and fast receding. 09:06: Will those astronomers ever figure out that there are countless other island universes stretching across a much vaster space time?
	2018-02-14: What is Energy? 14:02: ... Elytron points out the ridiculousness of astronomers calling all elements heavier than helium a metal, because technically, ...
	2018-01-31: Kronos: Devourer Of Worlds 04:04: In astro-speak, they tell us the star's metallicity, although for an astronomer, anything heavier than helium is called a metal.
	2017-12-13: The Origin of 'Oumuamua, Our First Interstellar Visitor 00:29: On October 19th this year, astronomers spotted an unusual object moving rapidly away from the sun. 02:19: And astronomers realized that this is consistent with an elongated body with a tumbling motion.
	2017-11-29: Citizen Science + Zero-Point Challenge Answer 00:15: [MUSIC PLAYING] The professional astronomer or astrophysicist is a pretty recent phenomenon. 00:33: ... trade, a classically trained musician, but as an amateur astronomer, he discovered Uranus and was the first to observe binary star systems, ... 01:26: Comets, in particular, are often discovered by amateur astronomers. 01:29: ... comet Hale-Bopp and Shoemaker-Levy 9, were co-discovered by amateur astronomers Thomas Bopp and Carolyn ...
	2017-11-02: The Vacuum Catastrophe 07:09: ... the late '90s, astronomers discovered that the expansion of the universe is, in fact, accelerating ... 08:38: ... out their zero point energies, at least enough of them to allow life and astronomers to ...
	2017-10-25: The Missing Mass Mystery 00:00: [MUSIC PLAYING] For years, astronomers have been unable to find up to half of the matter in the universe.
	2017-10-04: When Quasars Collide STJC 00:29: We may be about to find out, because astronomers report spotting a pair of them in a close binary orbit for the very first time. 10:08: ... finding will inspire astronomers to search for more of these dazzling giants, leading us closer to ...
	2017-09-13: Neutron Stars Collide in New LIGO Signal? 05:59: It was started by a tweet from astronomer J Craig Wheeler about a LIGO detection with an optical counterpart. 07:43: Astronomers don't trigger Hubble observations lightly.
	2017-08-30: White Holes 00:50: ... Astronomers have since demonstrated that black holes are very real with convincing ...
	2017-08-10: The One-Electron Universe 12:24: M. Paulson poked fun at astronomers for using "dark" to describe anything they don't understand-- dark matter, dark energy, dark flow.
	2017-08-02: Dark Flow 04:11: This allows astronomers to find extremely distant galaxy clusters just by studying the CMB.
	2017-06-07: Supervoids vs Colliding Universes! 13:39: Astronomers, right?
	2017-05-31: The Fate of the First Stars 01:19: Astronomers categorize stars according to the relative quantity of heavy elements that they possess. 01:25: By the way, astronomers call any element heavier than helium a metal. 02:51: Astronomers have been searching for the mythical pop three generation for decades.
	2017-04-05: Telescopes on the Moon 08:56: The moon with its thin atmosphere, stable surface, and long nights is an astronomer's dream.
	2017-01-25: Why Quasars are so Awesome 02:09: Then, in 1962, astronomers caught a break. 02:38: That timing allowed astronomers to identify a tiny star-like point of bluish light as the source of the radio emission. 02:46: Astronomers turned their optical telescopes on this strange star, and split the light into a spectrum.
	2017-01-11: The EM Drive: Fact or Fantasy? 10:54: But I'm no radio astronomer, so there are probably enormous difficulties in actually achieving that.
	2016-12-21: Have They Seen Us? 02:31: ... best astronomers have been engaged in the search for extraterrestrial intelligence, SETI, ...
	2016-11-16: Strange Stars 07:32: In the year 1181, Chinese and Japanese astronomers recorded a new star in the constellation of Cassiopeia. 08:00: ... pulsar in the Crab Nebula was also observed as a supernova by Chinese astronomers in 1054, except something was weird in the case of ... 09:17: ... dying star shouldn't have been massive enough to leave a black hole, yet astronomers still haven't found the expected neutron star at the location of the ...
	2016-11-09: Did Dark Energy Just Disappear? 00:21: ... in 1998 two independent teams of astronomers made an extremely controversial announcement: that the universe is not ... 00:37: These exploding white dwarf stars have predictable brightnesses that allow astronomers to figure out how far away they are.
	2016-06-15: The Strange Universe of Gravitational Lensing 01:57: ... British astrophysicist, Sir Arthur Eddington, loaded a ship full of astronomers and set sail for the island of Principe off the West coast of Africa and ... 07:36: Despite Einstein's pessimism, gravitational lensing has become an important staple in the astronomer's toolkit.
	2016-05-11: The Cosmic Conspiracy of Dark Energy Challenge Question 03:28: Close enough to 50-50 for an astronomer.
	2016-05-04: Will Starshot's Insterstellar Journey Succeed? 07:50: ... advisory team includes legendary engineer Freeman Dyson, the UK astronomer royal, Martin Rees, dark energy Nobel Laureate, Saul Perlmutter, and ...
	2016-04-27: What Does Dark Energy Really Do? 06:03: ... separate teams of astronomers spent years catching white dwarf supernovae exploding in galaxies ...
	2016-04-20: Why the Universe Needs Dark Energy 01:26: ... weighing up all of the matter in the universe, astronomers have figured out that there just isn't enough of anything to turn the ...
	2016-04-13: Will the Universe Expand Forever? 07:36: Astronomers worked for decades to weigh up the galaxies across vast swaths of the universe, including their dark matter.
	2016-03-30: Pulsar Starquakes Make Fast Radio Bursts? + Challenge Winners! 00:48: It was only recently, April 2015, that astronomers finally pinpointed a galaxy that an FRB came from.
	2015-11-18: 5 Ways to Stop a Killer Asteroid 02:58: ... Astronomers around the world have worked together as part of the Spaceguard Program ...
	2015-09-23: Does Dark Matter BREAK Physics? 03:00: Astronomers spent years counting MACHOs this way.
	2015-08-05: What Physics Teachers Get Wrong About Tides! 01:33: Something much more subtle is happening that even many professional astronomers and physicists misunderstand-- including me, for many years.
	2015-06-17: How to Signal Aliens 03:28: ... something like NASA's Kepler satellite, astronomers stare at 150,000 or so stars at once continually for a few years, ... 04:00: With a few Kerbal Keplers, the Kerbal astronomers could look at hundreds of thousands or millions of stars at once. 04:14: ... Kepler was even launched, French astronomer Luke Arnold wrote a paper-- link below-- showing that the transits of ...
	2015-06-03: Is Gravity An Illusion? 10:46: ... just like the Hubble telescope, has to be shared with lots of other astronomers who aren't looking at ... 11:04: But remember, astronomers have other reasons for studying exoplanets-- just basic science.
	2015-05-27: Habitable Exoplanets Debunked! 00:48: It's not that the press or astronomers are lying. 00:50: ... people imagine when they hear the phrase "habitable world," and what astronomers mean by that same ... 00:57: To astronomers, the phrase "habitable exoplanet" just means exoplanet that lies in the habitable zone of its host star. 02:39: ... that star, then based on how much light gets blocked and for how long, astronomers were able to infer the radius of the planet and some features of its ...
	2015-03-11: What Will Destroy Planet Earth? 04:38: Astronomers have gone back and forth on the answer.
	2015-02-25: How Do You Measure the Size of the Universe? 01:11: But it's even crazier that astronomers think they know that number.
	2015-02-11: What Planet Is Super Mario World? 04:52: ... to planets outside the solar system are trickier, because astronomers don't have good estimates of both mass and radius for most ...

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