Rotating Question Curious About Astronomy? Ask an Astronomer

Previously answered questions by Dave Kornreich

(in order of times viewed)

  1. How long does it take for the Sun's light to reach us?
  2. Why do stars twinkle?
  3. Which planets have rings?
  4. Can you hear sounds in space?
  5. What is that ring (or rainbow) around the moon?
  6. What is the life cycle of a star?
  7. Can artificial gravity be created in space?
  8. How do we know the age of the Universe and the Earth?
  9. When was the last time all 9 planets were aligned?
  10. What is a nova?
  11. What direction do planets rotate?
  12. Why do all the planets orbit in the same plane?
  13. Who first measured the speed of light?
  14. What are the requirements for being a planet?
  15. What are RA and DEC?
  16. What would happen if you took off your helmet in space?
  17. Why can't you see stars during the day?
  18. Why do we not have eclipses every month?
  19. How do we know the mass of the Earth and the Moon?
  20. How are elements heavier than iron formed?
  21. Why do stars change colour when they twinkle?
  22. How does light pollution affect astronomers?
  23. How do you measure the mass of a star?
  24. What are Altitude and Azimuth?
  25. How did asteroids form and what is the difference between an asteroid and a comet?
  26. What causes seasons?
  27. Why do planets not twinkle?
  28. What is the shape of the universe?
  29. Where did all the water in the universe come from?
  30. Where are stars born?
  31. Which hemisphere has the best view of the Milky Way?
  32. Can you see satellites?
  33. Why is twilight short near the equator?
  34. Why does the Moon look big on the horizon?
  35. Can we find the place where the Big Bang happened?
  36. How do gravitons escape black holes to tell the universe about their gravity?
  37. Do dead stars still shine?
  38. Will we get sucked into the black hole at the center of the Milky Way?
  39. What is time dilation?
  40. How can two moons of Saturn share the same orbit?
  41. Do you think it's possible to maintain life on other planets?
  42. What is a dimension?
  43. How are photons created and destroyed?
  44. If the universe is 15 billion years old, how can it be larger than 15 billion light years across?
  45. Why are there blue shifted galaxies?
  46. How big is the universe?
  47. How do I tell which planet is which?
  48. Do the Sun's or Earth's magnetic field reverse?
  49. Why is our solar system so different from all the others we've found?
  50. Why are there no craters on Earth? Did all the meteorites miss us?
  51. Why doesn't gravity change the speed of light?
  52. How do we measure distances to other stars?
  53. What happens when you change the mass of a White Dwarf or Neutron Star?
  54. Are time machines possible?
  55. How do we know if the universe will keep expanding forever?
  56. Do astronomers believe in astrology?
  57. Do you believe in UFOs?
  58. Why do most moons orbit their planets at the equator?
  59. How can geometry be different in space?
  60. How can we measure distances to more stars?
  61. Can life exist on the recently discovered extrasolar planets?
  62. Can one star orbit another?
  63. What is sidereal time?
  64. When unmanned spacecraft accelerate in space, what causes them to slow down?
  65. What equipment do I need for astrophotography?
  66. Have gravitational waves been proven to exist?
  67. What is a Dyson Sphere?
  68. How can I contribute to science as an amateur astronomer?
  69. Why is it important to study meteorites?
  70. What caused Shoemaker-Levy 9 to split up?
  71. Are the asteroids the remains of a planet which broke apart?
  72. Could we be seeing dead stars?
  73. Can you tell time by the Big Dipper?
  74. How could galaxies have gotten so far away in only 15 billion years?
  75. How powerful are quasars?
  76. What kind of telescope should I use for astrophotography?
  77. Can the theory of formation of the solar system explain all the observables?
  78. What makes a satellite geosyncronise itself with Earth's orbit?
  79. What's new with the Big Bang?
  80. Why search for only Earth-like life on other planets?
  81. If comets are boiling away, why are there any left?
  82. What are the boundaries of the constellations?
  83. What kinds of star clusters are there?
  84. Do electrons age?
  85. Can HST see the Oort cloud?
  86. Does the shuttle worry about space junk?
  87. How do distant galaxies differ from those nearby?
  88. What do stellar classifications mean?
  89. Is cosmic expansion happening on microscopic scales?
  90. How can you tell the difference between single and multiple extrasolar planets?
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