Search PBS Space Time


2022-11-09: What If Humanity Is Among The First Spacefaring Civilizations?

  • 01:30: We are in fact on a typical planet, orbiting a typical star in a typical galaxy.
  • 08:16: Since they’re very dim, orbiting planets need to be very close to the star in order to have liquid water, which may be necessary for life.

2022-03-23: Where Is The Center of The Universe?

  • 00:25: ... Copernicus shoved us from our pedestal onto a random rocky planet orbiting an ordinary star in the outskirts of an unremarkable ...

2021-12-29: How to Find ALIEN Dyson Spheres

  • 10:56: ... in brightness and colour over time, as might be expected if a giant orbiting structure partially eclipses the star in an irregular ...

2021-09-07: First Detection of Light from Behind a Black Hole

2021-08-03: How An Extreme New Star Could Change All Cosmology

  • 09:18: ... could be the result of a white dwarf collision. If two white dwarfs are orbiting each other, we expect them to slowly spiral together because they emit ...

2021-03-16: The NEW Crisis in Cosmology

  • 07:28: ... stellar parallax was taken as evidence that the Earth is NOT orbiting the Sun.   It turns out that the stars are just so  far ...

2021-02-17: Gravitational Wave Background Discovered?

  • 00:00: ... in the cores of most galaxies these super massive black holes can end up orbiting each other when galaxies collide and that slow fatal in spiral produces ...

2020-07-20: The Boundary Between Black Holes & Neutron Stars

  • 09:40: We see those in X-ray binaries - when a black hole is orbiting and cannibalizing another star.

2020-06-30: Dissolving an Event Horizon

  • 07:24: But in order for an object orbiting a black hole to fall into it, it actually has to lose at least some of that angular momentum.
  • 07:29: Otherwise it would just keep orbiting forever.

2020-06-22: Building Black Holes in a Lab

  • 00:16: ... one. Nonetheless, the evidence for their reality is overwhelming. Stars orbiting in crazy slingshot orbits around a patch of nothingness in the center of ...

2020-03-24: How Black Holes Spin Space Time

  • 05:49: ... you’re traveling in the same direction as the black hole spin. If you’re orbiting in the opposite direction, there are no stable orbits within 9 ...
  • 07:50: ... the angular coordinate becomes time-like - it’s as difficult to resist orbiting the black hole than it is to travel backwards in time - which is to say ...

2020-01-20: Solving the Three Body Problem

  • 06:43: ... was Leonhard Euler, who found a family of solutions for three bodies orbiting around a mutual center of mass, where all bodies remain in a straight ...

2020-01-13: How To Capture Black Holes

  • 04:50: ... than the full swarm, but there should still be plenty of black holes orbiting in the region. These will punch right through the accretion disk twice ...
  • 09:31: ... that was orbiting the binary suddenly finds itself moving too quickly for the reduced ...

2019-11-18: Can You Observe a Typical Universe?

  • 00:34: ... position at the center of the universe into just one of several planets orbiting the ...

2019-09-30: How Many Universes Are There?

  • 17:22: That brings us to the first part of the IAU definition - a planet has to be orbiting our Sun.

2019-09-23: Is Pluto a Planet?

  • 02:34: The solar system finally made observational and theoretical sense: there were now 6 planets orbiting the sun in perfect mathematical harmony.
  • 14:58: Dwarf planet David is a frigid, lifeless ball of ice and rock half the mass of Pluto and orbiting at the outer rim of the Kuiper belt.

2019-09-16: Could We Terraform Mars?

  • 13:19: The easiest would be to do that in space – an orbiting field generator placed between Mars and the Sun, like a giant space umbrella.

2019-05-01: The Real Science of the EHT Black Hole

  • 06:29: That orbiting light will eventually leave the photon sphere– either falling into the black hole or escaping outwards.

2019-03-06: The Impossibility of Perpetual Motion Machines

  • 06:36: Like a perfect Carnot engine, or a frictionless wheel – with or without magnets and mercury tubes – or a planet orbiting a star.

2018-11-21: 'Oumuamua Is Not Aliens

  • 10:24: And that's a pretty typical speed for a random object orbiting in the Milky Way.

2018-10-31: Are Virtual Particles A New Layer of Reality?

  • 16:52: They were apparently orbiting a center of mass that wasn't even between the stars.

2018-08-01: How Close To The Sun Can Humanity Get?

  • 03:12: We already monitor it constantly with ground-based telescopes and spacecraft orbiting the earth or orbiting the sun at a safe distance.

2018-05-16: Noether's Theorem and The Symmetries of Reality

  • 04:07: ... the spherically-symmetric gravitational field experienced by a satellite orbiting the earth-- then, Noether's theorem predicts another conserved quantity, ...

2018-04-25: Black Hole Swarms

  • 06:04: Hailey and team used the orbiting Chandra X-ray Observatory to hunt for these, and surprise, surprise, they found them.

2018-02-21: The Death of the Sun

  • 07:28: ... managed to escape the expanding sun and is now a lonely desolate world orbiting out in the old location of the asteroid belt, or perhaps it didn't quite ...

2018-01-31: Kronos: Devourer Of Worlds

  • 02:38: ... primary tool is Gaia, an orbiting telescope launched by the European Space Agency in 2013 on a five-year ...
  • 08:28: Andrew Milo recommends we block out some of the sun's light with orbiting solar farms.

2018-01-17: Horizon Radiation

  • 03:14: ... observers, be they floating in empty space or accelerating or orbiting a black hole, should agree on the basic result of that interaction-- two ...

2017-10-19: The Nature of Nothing

  • 07:58: ... partially shields the orbiting electrons from the positive charge of the nucleus, with the amount of ...

2017-10-11: Absolute Cold

  • 08:26: ... new observation of a potential pair of binary supermassive black holes orbiting only one light year ...
  • 09:53: ... if this binary pair is a whole light year apart, then for us to see them orbiting each other, they need to be traveling insanely ...
  • 10:06: But, actually, we haven't seen them orbiting each other.

2017-10-04: When Quasars Collide STJC

  • 00:38: ... a paper that reports the detection of a pair of supermassive black holes orbiting only one light-year apart from each ...

2017-09-28: Are the Fundamental Constants Changing?

  • 05:31: These same electrons are also orbiting the atomic nucleus, and that motion generates its own magnetic field.

2017-09-20: The Future of Space Telescopes

  • 08:40: The future could lie in orbiting rainbows, an idea as creative as it sounds.
  • 09:49: Results probably won't top those of the magnificent starshade and aragoscope, but the orbiting rainbow is cheap.
  • 10:47: ... when the first orbiting rainbow is launched and that sparkling glitter cloud is thrown into the ...

2017-09-13: Neutron Stars Collide in New LIGO Signal?

  • 03:17: And that gravitational radiation sucks energy from the orbiting system, causing the neutron stars to spiral inwards.

2017-08-24: First Detection of Life

  • 00:25: Now, a quarter of a century later, we're on the verge of conducting that same experiment on a world orbiting another star.

2017-07-19: The Real Star Wars

  • 07:53: ... fast-moving, non-explosive chunks of matter Brilliant Pebbles propose an orbiting weapons platform that delivered non-explosive missiles to destroy ...
  • 10:24: ... there was the Polyus spacecraft, a full-fledged orbiting the battle station that would have had a megawatt laser designed to take ...

2017-03-15: Time Crystals!

  • 11:54: Yet it's estimated that a system with an Earth-like planet orbiting a Sun-like star has around a 1% chance of transiting from our perspective.

2017-03-01: The Treasures of Trappist-1

  • 08:29: Remember also that a potentially habitable Earth-like planet was recently found orbiting the very nearby Proxima Centauri.

2017-02-02: The Geometry of Causality

  • 13:30: ... atoms, orbiting at around 10 times the Schwarzschild shield radius, undergo an extremely ...

2017-01-04: How to See Black Holes + Kugelblitz Challenge Answer

  • 05:34: ... two, Project Disco Ball, proposes a satellite network orbiting the Earth at half the moon's orbit radius, capable of generating a ...

2016-11-16: Strange Stars

  • 07:40: ... technological advancements, we pointed our radio telescopes and then the orbiting Chandra X-ray Observatory to that spot and found a young pulsar, a ...

2016-11-02: Quantum Vortices and Superconductivity + Drake Equation Challenge Answers

  • 05:05: So that means there are around 100 such planets orbiting stars like the sun within 100 light years.

2016-10-19: The First Humans on Mars

  • 01:14: It relaunches and delivers to the orbiting spaceship enough fuel for the four-month journey to Mars.

2016-07-27: The Quantum Experiment that Broke Reality

  • 12:35: My pleasure-- a resonant frequency is when two orbiting bodies have orbital periods that form a neat ratio of small integers.

2016-05-04: Will Starshot's Insterstellar Journey Succeed?

  • 05:51: ... with camera tech capable of resolving continents and oceans on planets orbiting Alpha Cen, assuming they have ...

2016-03-23: How Cosmic Inflation Flattened the Universe

  • 11:52: ... or centripetal force-- in this case, that's gravity-- acting on the orbiting ...
  • 12:08: The orbiting object is subject to the full acceleration caused by gravity, which is what causes it to move in an orbit.

2016-03-16: Why is the Earth Round and the Milky Way Flat?

  • 09:14: The gas can't fall any closer to the axis of rotation because it's orbiting that axis.

2016-02-17: Planet X Discovered?? + Challenge Winners!

  • 00:48: And presumably is just one of many such rocks orbiting the Sun in the vast Kuiper Belt, out beyond Neptune.

2016-02-11: LIGO's First Detection of Gravitational Waves!

  • 01:53: Any orbiting pair of massive objects generates gravitational waves.
  • 01:57: ... only extremely massive objects, through orbiting extremely close together, produce gravitational waves strong enough for ...
  • 04:31: ... squeezes per second, that matches the rate at which the black holes were orbiting each other just before ...

2015-10-28: Is The Alcubierre Warp Drive Possible?

  • 07:31: It'll be an orbiting gravitational wave observatory designed to detect much higher frequency gravitational waves than advanced LIGO.

2015-10-22: Have Gravitational Waves Been Discovered?!?

  • 02:03: But two objects orbiting each other, or an asymmetrically spinning or exploding thing, does.

2015-08-27: Watch THIS! (New Host + Challenge Winners)

  • 00:03: Which of two particles, one orbiting around the outside of a planet and one going straight through the middle, reaches the other side first?

2015-08-19: Do Events Inside Black Holes Happen?

  • 01:06: Suppose that I'm very far from a black hole and there's a pony orbiting the black hole.

2015-08-12: Challenge: Which Particle Wins This Race?

  • 00:36: That sphere is not rotating, and it's not orbiting any other larger bodies.
  • 00:46: Suppose that a particle is orbiting the planet right at the surface.
  • 00:49: And I know, technically it's not orbiting if it's on the surface.
  • 00:52: So fine, if it makes you feel better, say that it's orbiting a billionth of a nanometer above the surface.
  • 01:37: At the same time that the orbiting particle passes this point, let's release the second particle from rest from exactly the same height.

2015-06-17: How to Signal Aliens

  • 05:55: ... does now, should SETI also be looking for geometric alien billboards orbiting nearby ...

2015-06-03: Is Gravity An Illusion?

  • 08:27: Second, by your criterion, Einstein, orbiting frames of reference-- like on the space station-- should also be considered inertial.
55 result(s) shown.