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  • Shows Index
    • Aliens (1)
    • Amateur Astronomy (5)
      • Observing (5)
    • Astronomy (131)
      • Cosmology (22)
      • Galaxies (10)
      • Nebulae (2)
      • Observing (14)
      • Planets (39)
        • Extrasolar Planets (5)
        • Our Solar System (32)
      • Stars (18)
        • Compact Objects (3)
        • Stellar Evolution (8)
    • Chemistry (1)
    • History (1)
    • Listeners (40)
      • Questions Shows (35)
      • Student Questions (4)
    • People (9)
      • Doing Astronomy (2)
      • Interviews (6)
      • Meetings (5)
    • Physics (33)
      • Forces (9)
      • Particles (8)
      • Relativity (6)
    • Planetary Science (1)
    • Space Flight (9)
    • The Show (3)
      • Meetups (1)



  • Collaborators
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    Past Shows
    • Questions Show: Avoiding the Heat Death, Orbiting Galaxies, and the Dangers of Space Radiation
    • Ep. 141: Volcanoes, Hot and Cold
    • Ep. 140: Entanglement
    • Questions Show: Galileoscope, Black Hole Time, and What Exactly is Energy?
    • Questions Show: Telescope Suggestions, Black Hole Energy, and Universal Time
    • Ep. 139: Energy Levels and Spectra
    • Questions: An Unlocked Moon, Energy Into Black Holes, and the Space Station's Orbit
    • Ep. 138: Quantum Mechanics
    • Questions Show: Hidden Fusion, the Speed of Neutrinos, and Hawking Radiation
    • Ep. 137: Large Scale Structure of the Universe
    • Questions Show: The Source of Atmospheres, the Vanishing Moon, and a Glow After Sunset
    • Ep. 136: Gamma Ray Astronomy
    • Questions Show: Dangerous Solar Flares, Higgs Boson Insights, and Light Speed Flashlights
    • Ep. 135: X-Ray Astronomy
    • Questions Show: NorthEast Astronomy Forum (NEAF)
    • Ep. 134: Ultraviolet Astronomy
    • Ep. 133: Optical Astronomy
    • Questions Show: Undoing Inflation, Searching for Water, and Seeing Everything a Black Hole's Ever Eaten
    • Ep. 132: Infrared Astronomy
    • Episode 131: Submillimeter Astronomy
    • Questions Show: Decelerating Black Holes, Earth-Sun Tidal Lock, and the Crushing Gravity of Dark Matter
    • Episode 130: Radio Astronomy
    • Questions Show: Multiple Big Bangs, Satellite Collisions and the Size of the Universe
    • Ep. 129: Interferometry
    • Questions Show: Shooting Lasers at the Moon and Losing Contact with Rovers
    • Ep. 128: Dust
    • Ep. 127: The US Space Shuttle
    • Ep. 126 From Skeptics Guide with Questions
    • Ep. 125: A Zoo of Extrasolar Planets
    • Questions Show: Moons and the Drake Equation, Stars in the Void, and Rings Around Stars
    • Ep. 124: Space Capsules, Part 1 – Vostok, Mercury and Gemini
    • Ep. 123: Homogeneity
    • Ep. 122: How Old is the Universe?
    • Questions Show: Stellar Roche Limits, Seeing Black Holes, and Water on Mars
    • Ep. 121: Spacesuits
    • Ep. 120: The Christmas Star
    • Questions Show: Different Fields of Astronomy, Our Sibling Stars, and Hidden Lagrange Points
    • Ep. 119: Robots in Space
    • Questions Show: Distance in Space, Changing Earth's Orbit, and Different Sized Stars
    • Ep. 118: Sky Surveys
    • Ep. 117: Time
    • Ep. 116: Molecules in Space
    • Ep. 115: The Moon, Part 3: Return to the Moon
    • Questions Show: Spiral Arms, Seismic Waves on the Sun, and our Favorite Gear
    • Ep. 114: The Moon, Part 2 – Exploration of the Moon
    • Questions Show: Ice in Space, Expansion of the Universe, and Death from the Skies
    • Ep. 113: The Moon, Part 1
    • Questions Show: Orbit of the Planets, Green Stars, and Oort Cloud Contamination
    • Ep. 112: Death From the Skies, Interview with Phil Plait
    • Questions Show: Relativity, Relativity and More Relativity
    • Ep. 111: Nebulae
    • Questions Show: Galactic Dust, the Speed of Photons, and the Big Bang Calculations
    • Ep. 110: The Search for Extraterrestrial Intelligence
    • Questions Show: Alignment with the Galactic Plane, Destruction from Venus, and the Death of the Solar System
    • Ep. 109: The Life of Other Stars
    • Questions Show – Running Out of Gravitons and Hitting the Brakes at Light Speed
    • Ep. 108: The Life of the Sun
    • Questions Show – light speed, Andromeda galaxy, dark matter and black holes
    • Ep. 107: Nucleosynthesis: Elements from Stars
    • Questions Show – Black Hole Surfaces, Magnetic Field Strengths, and the Speed of Gravitons
    • Ep. 106: The Search for the Theory of Everything
    • Student Questions Show: Leelanau School
    • Ep. 105: The Strong and Weak Nuclear Forces
    • Ep 104: Science Fiction at Dragon*Con with Plait and Grazier
    • Ep. 103: Electromagnetism
    • Ep 102: Gravity
    • Ep. 101: Advanced Propulsion Systems
    • Ep. 100: Rockets
    • Ep. 99: The Milky Way
    • Ep. 98: Quasars
    • Ep. 97: Galaxies
    • Ep. 96: Humans to Mars, Part 3 – Terraforming Mars
    • Student Questions: Collinsville High School
    • Ep. 95: Humans to Mars, Part 2 – Colonists
    • Ep 94: Humans to Mars, Part 1 – Scientists
    • Ep. 93: Missions to Mars, Part 2
    • Ep. 92: Missions to Mars, Part 1
    • Ep. 91: The Search for Water on Mars
    • Ep. 90: The Scientific Method
    • Ep. 89: Adaptive Optics
    • Ep. 88: The Hubble Space Telescope
    • Ep. 87: The End of the Universe Part 2: The End of Everything
    • Ep. 86: The End of the Universe Part 1: The End of the Solar System
    • Ep. 85: Detectors
    • Ep. 84: Getting Around the Solar System
    • Ep. 83: Wave Particle Duality
    • Ep. 82: Space Junk
    • Ep. 81: Questions on the Shape, Size and Centre of the Universe
    • Ep. 80: Craters
    • Ep. 79: How Big is the Universe?
    • Ep. 78: What is the Shape of the Universe?
    • Ep. 77: Where is the Centre of the Universe?
    • Ep. 76: Lagrange Points
    • Student Questions: Curtis High School
    • Ep. 75: Stellar Populations
    • Ep. 74: Antimatter
    • Ep. 73: Questions Show #8
    • Ep. 72: Cosmic Rays
    • Ep. 71: Gravitational Waves
    • Ep. 70: How To Win a Nobel Prize
    • Student Questions: Farmersburg
    • Ep. 69: The Large Hadron Collider and the Search for the Higgs-Boson
    • Ep. 68: Globular Clusters
    • Ep. 67: Building a Career in Astronomy
    • Ep. 66: How Amateurs Can Contribute to Astronomy
    • Ep. 65: The End of Our Tour Through the Solar System
    • Ep. 64: Pluto and the Icy Outer Solar System
    • Ep. 63: Neptune
    • Ep. 62: Uranus
    • Ep. 61: Saturn's Moons
    • Ep. 60: Questions Show #7
    • Ep. 59: Saturn
    • Ep. 58: Inflation
    • Ep. 57: Jupiter's Moons
    • Ep. 56: Jupiter
    • Ep. 55: The Asteroid Belt
    • Ep. 54: Questions Show #6
    • Ep. 53: Astronomy in Science Fiction
    • Special Episode: Panspermia
    • Ep. 52: Mars
    • Ep. 51: Earth
    • Ep. 50: Venus
    • Ep. 49: Mercury
    • Ep. 48: Tidal Forces Across the Universe
    • Ep. 47: Tidal Forces
    • Ep. 46: Stellar Nurseries
    • Ep. 45: The Important Numbers in the Universe
    • Listener Survey
    • Ep. 44: Einstein's Theory of General Relativity
    • Ep. 43: Questions Show #5
    • Ep. 42: Magnetism Everywhere
    • Ep. 41: The Rise of the Supertelescopes
    • Ep. 40: American Astronomical Society Meeting, May 2007
    • Ep. 39: Astrology and UFOs
    • Ep. 38: Neutron Stars and their Exotic Cousins
    • Ep. 37: Gravitational Lensing
    • Ep. 36: Gamma-Ray Bursts
    • Ep. 35: Questions Show #4
    • Ep. 34: Discovering Another Earth
    • Ep. 33: Choosing and Using a Telescope
    • Ep. 32: The Search for Neutrinos
    • Ep. 31: String Theory, Time Travel, White Holes, Warp Speed, Multiple Dimensions, and Before the Big Bang
    • Ep. 30: The Sun, Spots and All
    • Ep. 29: Asteroids Make Bad Neighbors
    • Ep. 28: What is the universe expanding into?
    • Ep. 27: Questions Show #3
    • Ep. 26: The Largest Structures in the Universe
    • Ep. 25: The Story of Galaxy Evolution
    • Ep. 24: The Fermi Paradox: Where Are All the Aliens?
    • Ep. 23: Counting Aliens With the Drake Equation


Questions Show: Avoiding the Heat Death, Orbiting Galaxies, and the Dangers of Space Radiation

  • July 4th, 2009
  • Show Notes
  • Comments(0)
  • Like it? Digg-it | Reddit | del.icio.us

Orbiting galaxies. Okay, colliding really. NGC 6050 by Hubble

Orbiting galaxies. Okay, colliding really. NGC 6050 by Hubble

Will robots be able to avoid the heat death of the Universe? Can galaxies orbit each other like binary stars? And what are the dangers of space radiation to astronauts on the Moon?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

Avoiding the Heat Death, Orbiting Galaxies, and the Dangers of Space Radiation
(more…)


Click here for Shownotes and Transcripts...

Questions Show: Galileoscope, Black Hole Time, and What Exactly is Energy?

  • June 26th, 2009
  • Show Notes
  • Comments(8)
  • Like it? Digg-it | Reddit | del.icio.us

Galileoscope Logo

Galileoscope Logo


How can you get a Galileoscope of your very own? What happens to time inside a black hole? And what exactly is energy anyway?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

Galileoscope, Black Hole Time, and What Exactly is Energy?
(more…)


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Questions Show: Telescope Suggestions, Black Hole Energy, and Universal Time

  • June 22nd, 2009
  • Show Notes
  • Comments(3)
  • Like it? Digg-it | Reddit | del.icio.us

Celestron telescope.

Celestron telescope.


What starting telescope equipment does the Astronomy Cast team suggest? How much energy does a black hole generate? And how do we measure time outside the Earth?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

Telescope Suggestions, Black Hole Energy, and Universal Time
(more…)


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Questions: An Unlocked Moon, Energy Into Black Holes, and the Space Station's Orbit

  • June 6th, 2009
  • Show Notes
  • Comments(6)
  • Like it? Digg-it | Reddit | del.icio.us
What if the Moon wasn't tidally locked to the Earth?

What if the Moon wasn't tidally locked to the Earth?

What would happen if the Moon wasn't tidally locked to the Earth? What happens to all that mass and energy disappearing into a black hole? And how can we explain the space station's crazy orbit?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

An Unlocked Moon, Energy Into Black Holes, and the Space Station's Orbit
(more…)


Click here for Shownotes and Transcripts...

Questions Show: Hidden Fusion, the Speed of Neutrinos, and Hawking Radiation

  • June 4th, 2009
  • Show Notes
  • Comments(0)
  • Like it? Digg-it | Reddit | del.icio.us
The Sun. Image credit: NASA

The Sun. Image credit: NASA

Are new stars dark until their photons reach the surface? How fast do neutrinos travel? And what’s the story with Hawking Radiation?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

Hidden Fusion, the Speed of Neutrinos, and Hawking Radiation
(more…)


Click here for Shownotes and Transcripts...

Questions Show: The Source of Atmospheres, the Vanishing Moon, and a Glow After Sunset

  • May 19th, 2009
  • Show Notes
  • Comments(8)
  • Like it? Digg-it | Reddit | del.icio.us
Titan, seen by Cassini.

Titan, seen by Cassini.

How do planets get their atmospheres? What would happen to the Earth if the Moon just disappeared? And what’s that strange glow we see after sunset?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

The Source of Atmospheres, the Vanishing Moon, and a Glow After Sunset
(more…)


Click here for Shownotes and Transcripts...

Questions Show: Dangerous Solar Flares, Higgs Boson Insights, and Light Speed Flashlights

  • May 7th, 2009
  • Show Notes
  • Comments(2)
  • Like it? Digg-it | Reddit | del.icio.us
Typical solar flare. Image credit: NASA

Typical solar flare. Image credit: NASA

Can our Sun generate a solar flare that would wipe out life on Earth? Has the Large Hadron Collider answered any questions about the Higgs boson? And what would happen if you shined your flashlight out the front window of a spaceship going almost the speed of light?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

Dangerous Solar Flares, Higgs Boson Insights, and Light Speed Flashlights
(more…)


Click here for Shownotes and Transcripts...

Questions Show: NorthEast Astronomy Forum (NEAF)

  • May 1st, 2009
  • Show Notes
  • Comments(3)
  • Like it? Digg-it | Reddit | del.icio.us

neaf_logo
Pamela was lucky enough to attend the NorthEast Astronomy Forum, and while she was there she held a live questions show. And now you get to join in an hear the interesting questions, and Pamela's interesting answers.

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

NorthEast Astronomy Forum (NEAF)
(more…)


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Questions Show: Undoing Inflation, Searching for Water, and Seeing Everything a Black Hole's Ever Eaten

  • April 16th, 2009
  • Show Notes
  • Comments(6)
  • Like it? Digg-it | Reddit | del.icio.us
Expansion of the Universe

Expansion of the Universe

If there was enough mass to cause a big crunch, would inflation go backwards too? How do spacecraft know that hydrogen is bonded to water? And why can't we see everything that's ever fallen into a black hole?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

Undoing Inflation, Searching for Water, and Seeing Everything a Black Hole's Ever Eaten
(more…)


Click here for Shownotes and Transcripts...

Questions Show: Decelerating Black Holes, Earth-Sun Tidal Lock, and the Crushing Gravity of Dark Matter

  • March 31st, 2009
  • Show Notes
  • Comments(3)
  • Like it? Digg-it | Reddit | del.icio.us
Artist's impression of a black hole

Artist's impression of a black hole

This week we wonder if you can made a black hole by accelerating a mass, but then can you un-make it again? Will the Earth ever be tidally locked to the Sun? And can dark matter crush an unsuspecting space ship?

If you've got a question for the Astronomy Cast team, please email it in to info@astronomycast.com and we'll try to tackle it for a future show. Please include your location and a way to pronounce your name.

Decelerating Black Holes, Earth-Sun Tidal Lock, and the Crushing Gravity of Dark Matter

(more…)


Click here for Shownotes and Transcripts...

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Take a weekly facts-based journey through the cosmos with Astronomy Cast.