Rotating Question Curious About Astronomy? Ask an Astronomer

Previously answered questions by Kristine Spekkens

(in order of times viewed)

  1. Why are the Moon and Sun sometimes orange or red?
  2. What elements make up the Sun?
  3. How can a star burn with no oxygen?
  4. How can the Universe expand faster than the speed of light during inflation?
  5. Can you fire a gun on the Moon?
  6. How does the Moon stay "suspended" in the air?
  7. Is it possible to measure the temperature of the Sun?
  8. Is the Moon seen as a crescent (and not a "boat") all over the world? Is the same phase of the moon visible from the Northern and Southern hemispheres?
  9. How do you calculate the azimuth and altitude of an object?
  10. Are names given to black holes?
  11. Can we look back far enough in time to see the Big Bang?
  12. Can the acceleration of the Universe be analogous to apparent acceleration in a airplane?
  13. Do supermassive black holes cause galaxy rotation?
  14. Why does the Sun appear larger on the horizon than overhead?
  15. Why don't people walk upside-down on the bottom of the Earth?
  16. Can I calculate the size of the Universe by converting light years to kilometres?
  17. Why doesn't dark matter fall into a black hole?
  18. Who (and when) discovered that the earth's axis is on a 23 degree tilt?
  19. Why do pictures of distant galaxies have higher resolution than those of nearby planets?
  20. Can I communicate faster than light?
  21. Is there a beginning and an end to a galaxy's life?
  22. Why is sea water salty, and not lake water?
  23. Do the Sun's or Earth's magnetic field reverse?
  24. What was that really big falling star that I saw?
  25. Is the Earth at the centre of the Universe?
  26. How do sunrise and sunset times change with altitude?
  27. How many moles of stars are in the known universe?
  28. How are galaxy distances inferred from their recessional velocities?
  29. When are there 5 Sundays in February?
  30. Can you use an infinite line of reflectors to send light to the edge of the Universe?
  31. What colors are visible through an amateur telescope?
  32. What is the origin of the stellar classification system "OBAFGKM"?
  33. Can two lunar eclipses occur in the same month?
  34. How are galaxies and solar systems similar?
  35. Do the magnitudes and colors of stars ever change?
  36. Is there such a thing as hyperspace?
  37. How do we know that sunspots are associated with the Sun's magnetic field?
  38. How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda?
  39. Would the biggest airplanes cause tsunamis if they crashed?
  40. Can I see details on Venus?
  41. Why do photos of space taken from space never show any stars?
  42. Where does the kinetic energy of infalling bodies come from?
  43. Did I really hear a meteor?
  44. How is the Cepheid yardstick validated?
  45. What would happen if there was a collision between two white dwarfs?
  46. Why was the Platonic year named after Plato?
  47. Does inflation allow for an infinite number of universes?
  48. How can we find galaxies behind the Milky Way?
  49. Why is pressure broadening greater in low mass stars than in high mass stars?
  50. What causes a particle to decay?
  51. How long has humanity known that we live in a galaxy similar to others in the Universe?
  52. What would happen if you went back in time and killed your grandmother?
  53. Does the temperature of matter increase as it is accelerated to relativistic speeds?
  54. Can astronomers observe anything when the moon is full?
  55. Do we really observe the edges of galaxies at different epochs?
  56. Do we have to worry about relativity when studying galactic objects?
  57. Do binary or triple star systems form together?
  58. How are planets affected by the Hot Ionised Medium?
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