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	2022-11-09: What If Humanity Is Among The First Spacefaring Civilizations? 08:42: But this isn’t the scientific consensus, and notably these researchers are not planetary scientists nor astrobiologists.
	2022-07-20: What If We Live in a Superdeterministic Universe? 18:07: ... points out, aliens would surely give some tests we could run to not risk planetary destruction.The fact that their designs are cataclysmic if assembled ...
	2022-06-22: Is Interstellar Travel Impossible? 05:18: These sort of micrometeorites are somewhat common within the solar system - leftovers from the formation of the planetary system. 07:03: Grains larger than this are exceedingly rare outside of planetary system. 13:42: But it turns out there’s nothing in principle stopping us from slowly limping from one planetary system to the next.
	2022-05-18: What If the Galactic Habitable Zone LIMITS Intelligent Life? 00:24: ... significantly less heavy elements it could never have formed a planetary system, but   too much heavy elements and it might host only ... 01:07: ... before. But one possible solution is that the Sun   and its planetary system are really quite unique  in its ability to spawn and nurture ... 04:32: ... there   are several tens of billions of them. Having a  planetary system is also not unusual. The Kepler   mission demonstrated ... 06:56: ... to the formation of the Galaxy   to figure out where habitable planetary systems could have formed in the first place. Our galaxies ... 10:04: ... disk  to seed itself with enough heavy elements to   form planetary systems. In fact, some of  our galaxy still hasn’t had enough ... 11:12: ... we can say a little more about the emergence of  life-friendly planetary systems. And by “we”,   I mean Charlie Lineweaver, Yeshe ... 13:03: ... There is a roadblock in the chain from  forming a habitable planetary system   to sparking simple life to complexifying into ... 10:04: ... disk  to seed itself with enough heavy elements to   form planetary systems. In fact, some of  our galaxy still hasn’t had enough ... 11:12: ... we can say a little more about the emergence of  life-friendly planetary systems. And by “we”,   I mean Charlie Lineweaver, Yeshe Fenner and ... 06:56: ... to the formation of the Galaxy   to figure out where habitable planetary systems could have formed in the first place. Our galaxies started   like ... 11:12: ... estimated the  historical emergence of life-friendly planetary   systems accounting for all the stuff we talked  about. They started ... 13:03: ... about the others.   There is something special about this planetary system, even with our personal bias that we orbit   most important and ...
	2022-03-08: Is the Proxima System Our Best Hope For Another Earth? 01:55: Perhaps they also bore planetary systems - and even planets like the Earth. 04:53: We couldn’t see a planetary system that’s “face-on” - fully in the plane of the sky. 05:20: That restricts the transit method to planetary systems that are almost perfectly edge-on. 05:26: Nonetheless the Kepler mission found 2600+ exoplanets this way, and extrapolating from that revealed that most stars host planetary systems. 08:30: We have a bona fide planetary system in at least one of the stars in the Alpha-Cen system. 11:22: ... - flares - that blast high energy particles and radiation through the planetary ... 11:43: ... sufficiently thick atmosphere and strong planetary magnetic field could in principle protect any surface dwellers, who ... 12:50: ... not crazy, because planetary formation models indicate that there wouldn’t have been enough material ... 11:43: ... sufficiently thick atmosphere and strong planetary magnetic field could in principle protect any surface dwellers, who would then ... 01:55: Perhaps they also bore planetary systems - and even planets like the Earth. 05:20: That restricts the transit method to planetary systems that are almost perfectly edge-on. 05:26: Nonetheless the Kepler mission found 2600+ exoplanets this way, and extrapolating from that revealed that most stars host planetary systems. 01:55: Perhaps they also bore planetary systems - and even planets like the Earth.
	2021-12-29: How to Find ALIEN Dyson Spheres 04:21: Anything capable of producing that much power at that low a temperature must be huge - the size of a planetary orbit. 05:06: ... disk of gas surrounding a new-born star that will eventually form planetary ... 04:21: Anything capable of producing that much power at that low a temperature must be huge - the size of a planetary orbit. 05:06: ... disk of gas surrounding a new-born star that will eventually form planetary systems. ... 04:58: Unfortunately, there are some obvious natural explanations for a planetary-orbit-sized object at a few hundred Kelvin temperature.
	2021-11-17: Are Black Holes Actually Fuzzballs? 15:05: ... PhD examined Martian Atmospheric Haze and he worked with the most famous planetary scientist of all - Carl ...
	2021-05-11: How To Know If It's Aliens 11:24: ... exciting because Proxima Cen was also recently shown to have a planetary system, including a nearly Earth-mass planet it its habitable zone, ...
	2020-12-15: The Supernova At The End of Time 02:39: ... its extremely brief phase as a bright ball of hydrogen, bathing a young planetary system in the energy produced by its fusion ...
	2020-10-05: Venus May Have Life! 01:05: It’s bright because it’s close and it’s big, at 90% Earth’s diameter, and its our closest planetary neighbor. 12:15: The discovery of alien life in our nearest planetary neighbor would totally change our calculations about the frequency of life in the universe. 01:05: It’s bright because it’s close and it’s big, at 90% Earth’s diameter, and its our closest planetary neighbor. 12:15: The discovery of alien life in our nearest planetary neighbor would totally change our calculations about the frequency of life in the universe.
	2020-09-08: The Truth About Beauty in Physics 02:04: Kepler’s three laws of planetary motion are arguably much less elegant than Copernicus’ simple model - a touch uglier. 02:19: There IS an extremely simple, elegant law underlying planetary motion - it's Newton’s Law of Universal Gravitation. 02:04: Kepler’s three laws of planetary motion are arguably much less elegant than Copernicus’ simple model - a touch uglier. 02:19: There IS an extremely simple, elegant law underlying planetary motion - it's Newton’s Law of Universal Gravitation.
	2020-06-08: Can Viruses Travel Between Planets? 00:17: And that’s because it turns out viruses don’t just influence organisms - they’re incredibly important on a planetary scales. 01:37: I want to do this review to highlight the details of viruses that make them important on a planetary, and even interplanetary scales. 10:37: ... that’s the only known way to really spread LOTS of viruses between planetary ... 00:17: And that’s because it turns out viruses don’t just influence organisms - they’re incredibly important on a planetary scales. 10:37: ... that’s the only known way to really spread LOTS of viruses between planetary systems. ...
	2020-04-07: How We Know The Earth Is Ancient 11:02: ... formed at the same time as the Earth - both coallescing after a giant planetary impact in the early solar system. Now the moon is tectonically inactive, ...
	2020-01-20: Solving the Three Body Problem 00:20: ... the beauty of Newton’s equations, they lead to a simple solution for planetary motion in only one case - when two and only two bodies orbit each other ... 02:06: ... bodies - be it the parabola of a thrown ball, the circle or ellipse of a planetary orbit, or the hyperbola of an interstellar comet - in general, conic ... 05:01: ... are useful, but ultimately fail to predict perfectly. Even the smallest planetary bodies have some mass, and the solar system as a whole has many massive ... 00:20: ... the beauty of Newton’s equations, they lead to a simple solution for planetary motion in only one case - when two and only two bodies orbit each other sans ... 02:06: ... that Johanne Kepler figured out much about the elliptical solution for planetary motion 70 years before Newton’s laws were even ...
	2020-01-13: How To Capture Black Holes 07:17: ... infant planetary systems, a disk of gas and dust surrounds the newly-formed star - a ...
	2019-12-17: Do Black Holes Create New Universes? 02:52: The universe that is better at making stars is better at making planetary systems is better at making us.
	2019-11-18: Can You Observe a Typical Universe? 16:26: ... if this were the Goldilocks universe there would be life on almost every planetary body, even in this solar ...
	2019-11-11: Does Life Need a Multiverse to Exist? 14:52: ... non-standard for planets, even as we learn more and more about other planetary ...
	2019-11-04: Why We Might Be Alone in the Universe 01:22: For example, in a planetary biosphere rather than floating in the void between the galaxies. 09:06: Our entire planetary system is pretty weird. 09:09: We’ve only figured this out as the Kepler mission wrapped up its census of other planetary systems. 01:22: For example, in a planetary biosphere rather than floating in the void between the galaxies. 09:09: We’ve only figured this out as the Kepler mission wrapped up its census of other planetary systems.
	2019-09-30: How Many Universes Are There? 15:19: ... special props to Regolith on the spacetime discord, who's a bona fide planetary ... 15:37: ... definition is arbitrary and ambiguous, second that it should have been planetary scientists that made this decision, not ... 16:27: And that's an issue that planetary scientists take. 18:04: ... to change the definition again - perhaps this time with more input from planetary ... 15:19: ... special props to Regolith on the spacetime discord, who's a bona fide planetary scientist. ... 15:37: ... definition is arbitrary and ambiguous, second that it should have been planetary scientists that made this decision, not ... 16:27: And that's an issue that planetary scientists take. 18:04: ... to change the definition again - perhaps this time with more input from planetary scientists. ...
	2019-09-23: Is Pluto a Planet? 00:06: The surprisingly vicious debate over the planetary status of Pluto has given us a fascinating glimpse into what a scientific definition really is. 04:10: After all, Ceres is 20% the diameter of Mercury, so it’s in the planetary ballpark. 00:06: The surprisingly vicious debate over the planetary status of Pluto has given us a fascinating glimpse into what a scientific definition really is.
	2019-09-16: Could We Terraform Mars? 04:23: ... a nice Nature Astronomy article last year, planetary scientists Bruce Jakosky and Christopher Edwards calculate the ...
	2019-07-25: Deciphering The Vast Scale of the Universe 00:25: That’s a quadrillion stars, and as many planetary systems.
	2019-03-20: Is Dark Energy Getting Stronger? 12:15: ... eventually it could cause the universe to expand inside galaxies, inside planetary systems, and eventually even inside ...
	2018-12-06: Did Life on Earth Come from Space? 00:37: ... to a rock that travels between planets now we know that debris from planetary surfaces can be ejected into space during asteroid or comet impacts ...
	2018-11-21: 'Oumuamua Is Not Aliens 02:26: ... the stars, probably ejected in the violent early stages of formation of planetary ... 08:44: And by that I mean the expected density of space rocks that are ejected during the planetary formation process. 02:26: ... the stars, probably ejected in the violent early stages of formation of planetary systems. ...
	2018-10-25: Will We Ever Find Alien Life? 12:25: Are we more inclined to acts of self-destruction and planetary sabotage or to acts of preservation and exploration?
	2018-08-30: Is There Life on Mars? 02:53: Nonetheless, the prospect of a watery Mars kicked off centuries of optimism for an inhabited planetary neighborhood.
	2018-08-23: How Will the Universe End? 04:23: Believe it or not, many of those black dwarfs will still have planetary systems from their days as regular stars. 04:40: The next destructive event is that every planetary system in the galaxy will eventually be disrupted by close encounters between stellar remnants. 04:54: It'll take something like 1,000 trillion years, 10 to the power of 15 years, for, essentially, all planetary systems to be obliterated in this way. 04:23: Believe it or not, many of those black dwarfs will still have planetary systems from their days as regular stars. 04:54: It'll take something like 1,000 trillion years, 10 to the power of 15 years, for, essentially, all planetary systems to be obliterated in this way.
	2018-06-27: How Asteroid Mining Will Save Earth 00:26: ... the banner of a new company, Planetary Resources, they would mine asteroids for their precious resources and ... 04:40: ... Planetary Resources company estimates that a single 30-meter asteroid may contain ... 07:24: This asteroid prospecting is the current focus of effort for Planetary Resources and its competitors. 07:46: Planetary Resources is developing its Arkyd spacecraft with that initial goal. 00:26: ... the banner of a new company, Planetary Resources, they would mine asteroids for their precious resources and perhaps save ... 04:40: ... Planetary Resources company estimates that a single 30-meter asteroid may contain $30 ... 07:24: This asteroid prospecting is the current focus of effort for Planetary Resources and its competitors. 07:46: Planetary Resources is developing its Arkyd spacecraft with that initial goal. 04:40: ... Planetary Resources company estimates that a single 30-meter asteroid may contain $30 billion in ...
	2018-05-09: How Gaia Changed Astronomy Forever 06:38: Based on the new data, we've already been able to confirm a gap in planetary radius size, at around 1.9 Earth radius.
	2018-05-02: The Star at the End of Time 07:32: We know that red dwarfs do have planetary systems.
	2018-04-25: Black Hole Swarms 01:49: Dense elements, like iron, sink to the centers of forming planetary bodies in a process called differentiation.
	2018-03-28: The Andromeda-Milky Way Collision 07:13: No, our planetary system will probably survive this encounter.
	2018-02-21: The Death of the Sun 07:02: Explosions of runaway fusion in the double burning shell blast away the outer layers, perhaps creating a beautiful planetary nebula.
	2018-01-31: Kronos: Devourer Of Worlds 05:10: Just like its mythological namesake, perhaps Kronos ate its children, perhaps the extra elements of the vaporized remains of its own planetary system. 06:01: The Princeton research ethics policies are strict about actual planetary destruction. 06:33: ... sometime well after its formation and after the formation of any planetary ... 06:01: The Princeton research ethics policies are strict about actual planetary destruction.
	2017-12-13: The Origin of 'Oumuamua, Our First Interstellar Visitor 04:50: But perhaps Oumuamua got some sort of gravitational kick from an unknown planetary body. 09:00: In the meantime, it joins its countless interstellar cousins, orphaned planetary debris, stretching across the reaches of space time. 04:50: But perhaps Oumuamua got some sort of gravitational kick from an unknown planetary body. 09:00: In the meantime, it joins its countless interstellar cousins, orphaned planetary debris, stretching across the reaches of space time.
	2017-11-22: Suicide Space Robots 05:49: ... a sacrifice had to be made by decree of NASA's awesomely named Office of Planetary ... 06:13: The Planetary Protection Agency has issued death sentences in the past. 06:42: Some of the most mysterious entities in our solar system are the comets that dwell in the Kuiper Belt far outside our planetary system. 05:49: ... a sacrifice had to be made by decree of NASA's awesomely named Office of Planetary Protection. ... 06:13: The Planetary Protection Agency has issued death sentences in the past.
	2017-10-04: When Quasars Collide STJC 00:08: Red giant stars incinerate planetary systems, but neutron stars cannibalize their red giant neighbors.
	2017-09-13: Neutron Stars Collide in New LIGO Signal? 14:22: Only a small fraction of planetary systems are conveniently aligned so as to do that, and the Proxima Cen system isn't one of them.
	2017-08-24: First Detection of Life 07:42: ... the star's light, we're left with a set of absorption features from the planetary atmosphere ...
	2017-03-15: Time Crystals! 11:18: Matthew Pick asks about the transit method, and wonders how rare it is for a planetary system to be lined up so we actually see the transit. 11:31: The Kepler Space Telescope has so far discovered 2,330 confirmed exoplanets in 578 planetary systems.
	2017-03-01: The Treasures of Trappist-1 00:19: ... PLAYING] The TRAPPIST-1 planetary system was discovered by Dr. Michael Gillon and team and reported in the ... 06:27: This planetary system probably had a traumatic youth, which may not have been ideal for starting life.
	2017-02-22: The Eye of Sauron Reveals a Forming Solar System! 01:57: The whirlpool of debris left over after the star formed, and from which a planetary system may now be forming.
	2016-10-19: The First Humans on Mars 06:12: This has been proposed for artificial gravity on long-term space missions, but it's also possible on a planetary surface.
	2016-10-12: Black Holes from the Dawn of Time 08:14: If it passed anywhere near the planetary system, the gravitational tug would disrupt the planet's orbits.
	2016-09-21: Quantum Entanglement and the Great Bohr-Einstein Debate 13:31: But if these artificial panspermianic seeds are common, then we should expect to find them in space and on other planetary surfaces.
	2016-09-14: Self-Replicating Robots and Galactic Domination 03:50: ... that will be powered by a solar sail-fed ion drive that could harvest planetary resources to build more of itself-- a self-replicating spacecraft, a Von ... 05:55: ... it launches probes to actually explore the planetary system, and stream the data back home, or terraform the system, or build ... 03:50: ... that will be powered by a solar sail-fed ion drive that could harvest planetary resources to build more of itself-- a self-replicating spacecraft, a Von Neumann ...
	2016-08-24: Should We Build a Dyson Sphere? 01:38: The plausibility of a solid sphere the size of a planetary orbit is not really in question.
	2016-08-10: How the Quantum Eraser Rewrites the Past 11:10: ... the solar system, even if nowhere near the Earth, would probably disrupt planetary orbits and either rearrange or scatter our planetary ...
	2016-08-03: Can We Survive the Destruction of the Earth? ft. Neal Stephenson 08:14: But there is one threat that no settlement on any planetary surface or space hotel in the solar system can protect us from-- that's an exploding star. 09:44: No planetary surface or space ark in the solar system would be safe from a supernova or a gamma ray burst. 08:14: But there is one threat that no settlement on any planetary surface or space hotel in the solar system can protect us from-- that's an exploding star. 09:44: No planetary surface or space ark in the solar system would be safe from a supernova or a gamma ray burst.
	2016-07-06: Juno to Reveal Jupiter's Violent Past 00:50: In fact, its effect during the first billion years of the solar system's formation defines the positions of all planetary orbits. 05:20: With these first millions of years of planetary life, it was still embedded in the thick protoplanetary disk. 00:50: In fact, its effect during the first billion years of the solar system's formation defines the positions of all planetary orbits.
	2016-04-13: Will the Universe Expand Forever? 11:23: ... and then blown into space as the outer layers are blown away into a planetary ...
	2016-04-06: We Are Star Stuff 07:45: And with them, planetary systems and life.
	2016-02-17: Planet X Discovered?? + Challenge Winners! 00:35: ... to dwarf planet partly due to Brown's discovery of Eris, a distant planetary body that's larger than ...
	2015-09-30: What Happens At The Edge Of The Universe? 08:03: For example, the predictions GR makes for planetary orbits can give us a mass for the Sun.
	2015-08-27: Watch THIS! (New Host + Challenge Winners) 03:19: ... assuming the collision with Andromeda doesn't disrupt our planetary system, it'll be a white dwarf remnant, and after the sun ejects its ...
	2015-08-19: Do Events Inside Black Holes Happen? 06:29: For example, that is an allowed planetary orbit in that region.
	2015-07-29: General Relativity & Curved Spacetime Explained! 07:50: ... those geodesics into 3D spatial and temporal terms, what you find is planetary orbits or spatially straight, radially inward trajectories along which ...
	2015-06-03: Is Gravity An Illusion? 11:08: ... want better understandings of how planetary systems form, of how proximity to different kinds of stars affects the ...
	2015-05-27: Habitable Exoplanets Debunked! 04:44: The second method takes advantage of what are called planetary transits.
	2015-04-29: What's the Most Realistic Artificial Gravity in Sci-Fi? 06:43: ... Grazier, a planetary scientists formerly at NASA, who was also the science adviser for ...
	2015-03-18: Can A Starfox Barrel Roll Work In Space? 00:52: When The Arwing is in a planetary atmosphere, a barrel roll is child's play, it's aerobatics 101.
	2015-03-11: What Will Destroy Planet Earth? 05:54: ... galaxies, then inside planetary systems, inside planets themselves until literally, everything in a ...

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