Rotating Question Curious About Astronomy? Ask an Astronomer

Previously answered questions by Christopher Springob

(in order of times viewed)

  1. When will Halley's Comet return?
  2. What makes the Earth rotate?
  3. Is the distance from the Earth to the Sun changing?
  4. Do stars move in the sky?
  5. What is the hottest time of day?
  6. Does the Sun rotate?
  7. Which planet is most similar to Earth?
  8. Why is the Universe flat and not spherical?
  9. What would happen if a supermassive black hole came close to the Earth?
  10. How does the Sun compare to other stars?
  11. Traveling at light speed, how long would it take to get to the nearest galaxy?
  12. Why does the Sun's apparent path through the sky change throughout the year?
  13. What is the largest structure in the universe?
  14. What are some astronomy science fair projects?
  15. Are the planes of solar systems aligned with the plane of the Galaxy?
  16. Is there a "South Star"?
  17. Could someone travel the universe in his or her own lifetime?
  18. Why can we see the sun's image before sunrise and after sunset?
  19. How long would it take for a mini-black hole to eat the Earth?
  20. Is the Sun always up for exactly 12 hours at the equator?
  21. Is the Great Wall the largest galaxy cluster?
  22. What is the approximate GPA needed in High School in Math and Science to be an astronomer?
  23. How is it that we see farther out in space (farther back in time) than in the past?
  24. Which American colleges teach astronomy?
  25. How do we know if the universe will keep expanding forever?
  26. How long does it take the Big Dipper to move in the sky?
  27. Don't tachyons travel faster than light?
  28. Can you use an infinite line of reflectors to send light to the edge of the Universe?
  29. Has anyone made a map of the Milky Way?
  30. Why do so many of the world's UFO sightings happen in America?
  31. Can two lunar eclipses occur in the same month?
  32. Could you escape from a black hole if you were able to go faster than the speed of light?
  33. Which way does the sun travel in the southern hemisphere?
  34. Why do we assume that the universe is homogeneous?
  35. Are there any dark stars or dark galaxies made of dark matter?
  36. Is there a list of the sizes of different kinds of stars?
  37. Did a giant impact cause the Dark Ages?
  38. Does Cerenkov radiation travel faster than light?
  39. If clocks run slow in a gravitational field, how can we know the true age of the Solar System and Universe?
  40. Why doesn't light from distant galaxies reach us instantaneously?
  41. How does the Earth compare in size to the entire universe at the present epoch?
  42. Could a different theory of gravity explain the dark matter mystery?
  43. How do we know that superclusters are the largest structures in the universe?
  44. Do unmanned spacecraft like Voyager travel in straight lines?
  45. Did time go slower just after the Big Bang?
  46. Can I listen to the SETI@home radio signal?
  47. Does the Sun have any heavy elements?
  48. How do astronomers observe the Sun's interior?
  49. What makes a satellite geosyncronise itself with Earth's orbit?
  50. Why does the apparent density of galaxies drop off at larger distances?
  51. Would a planet near the galactic center have a brighter night sky?
  52. Do stars' orbits in galaxies obey Kepler's Laws?
  53. What would the Big Crunch look like to an observer on Earth?
  54. Could our position in the universe affect our perceptions of the expansion?
  55. How can the Sun have such a strong gravitational field if it's made of gasses?
  56. Does a photon observe other photons moving past it at the speed of light?
  57. Why is the WMAP picture of the CMB an ellipse?
  58. What would an "open geometry" for the universe look like?
  59. Why aren't discoveries of extrasolar planets reported on the news?
  60. What are collections of galaxies called?
  61. Why do supernova remnants look like rings rather than spheres?
  62. What kind of interference must astronomers contend with when observing?
  63. Can astronomers observe anything when the moon is full?
  64. If the universe is "bounded" today, could it one day become "unbounded"?
  65. How can observations of the distant universe prove that the expansion is accelerating *now*?
  66. No matter how fast the universe is expanding, shouldn't gravity eventually make it recollapse?
  67. Why is it easier to see a star if you look slightly to the side?
  68. What percent of the time can astronomers observe without interference from the Moon?
  69. Could matter-anti-matter repulsion power the expansion of the universe?
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URL: http://curious.astro.cornell.edu/authorlist.php?number=12
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Last modified: November 19, 2007 11:28:35 AM

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