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• Where did the Moon come from?

  Asked by ETpro | 38 responses

• Does gravitational energy convert to heat?

  Asked by GeorgeGee | 11 responses

• Why aren't there any really big stars?

  Asked by GeorgeGee | 16 responses

• Do you think this article marks the beginning of the end of life on earth?

  Asked by GeorgeGee | 15 responses

• Is laser light unnatural?

  Asked by GeorgeGee | 12 responses

• Question about star wobble as it relates to planet discovery?

  Asked by cockswain | 6 responses

• Does anyone know any good book to get started into the astronomy,astrophysics field?

  Asked by Christian95 | 13 responses

• What's your Strange Universe example to illustrate Sir Arthur Eddington's quote?

  Asked by ETpro | 31 responses

• How do astronauts pee in zero gravity?

  Asked by Christian95 | 17 responses

• How many black holes are there in the Milky Way and why are there so many different scientific estimates?

  Asked by mattbrowne | 14 responses

• What kind of schools could I get into?

  Asked by Parrappa | 9 responses

• I would like to create a useful Smartboard application- any suggestions?

  Asked by pallen123 | 8 responses

• How do we know the universe is infinite?

  Asked by The_Compassionate_Heretic from iPhone | 36 responses

• What happens with the energy in you after you die?

  Asked by Christian95 | 39 responses

• How do we know that all we see is real?

  Asked by Christian95 | 56 responses

• What do you think about Joao Magueijo's variate speed of light concept?

  Asked by Christian95 | 9 responses

• Can you steer me in the right direction for my graduation project?

  Asked by Parrappa | 13 responses

• Best physics/astrophysics book?

  Asked by Christian95 | 5 responses

• Why E=mc2?

  Asked by Christian95 | 30 responses

• Do you think that today's physics are right?

  Asked by Christian95 | 46 responses

• What exactly happens when a (hypothetical) antimatter black hole merges with a 'normal' black hole?

  Asked by mattbrowne | 11 responses

• Does anybody have weird superstitions about solar eclipses?

  Asked by Christian95 | 15 responses

• How do you feel about the 40th anniversary of moon landings?

  Asked by Christian95 | 75 responses

• A colorful variety: white dwarfs, yellow dwarfs, orange dwarfs, red dwarfs, brown dwarfs, black dwarfs, red giants, blue supergiants - What is your favorite object in the night sky?

  Asked by mattbrowne | 19 responses

• When we harness tidal energy from the moon, what energy source is depleted?

  Asked by ben | 35 responses

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