1. [Updated]What do stars look like up close?
2. [Updated]How big is the largest star known compared to the Sun?
3. [Updated]Can astronomers predict when a star will become a nova or a supernova?
4. [Updated]How many stars are born each year?
5. [Updated]How many stars are there?
6. [Updated]Since we see stars the way they were thousands of years ago, could some of them already be gone?
7. [Updated]How hot do stars get?
8. [Updated]How old do stars get?
9. [Updated]Do stars move?
10. [Updated]When we see stars, have they already burned up?
11. [Updated]How long is the average life of a star?
12. [Updated]How many stars are there like the Sun?
13. [Updated]Is a supernova the same thing as a nova, but just brighter?
14. [Updated]Do stars ever loose mass after they are formed?
15. [Updated]How did astronomers discover how stars were formed?
16. [Updated]How many stars are there like our sun within the Milky Way?
17. [Updated]How do stars shine?
18. [Updated]What planets outside our solar system do we know the most about?
19. [Updated]How would we detect the atmosphere of a planet orbiting another star?
20. [Updated]How can we possibly know how old a star really is?
21. [Updated]Is there life outside our solar system?
22. [Updated]How fast would a neutron star have to rotate to break up?
23. [Updated]What is SS-433?
24. [Updated]Where did all the heavy elements come from?
25. [Updated]If you could travel to any star cluster, which one would be the prettiest?
26. [Updated]Are there any civilizations that never paid much attention to stars?
27. [Updated]Have we ever seen two stars eat eachother?
28. [Updated]From Alpha Centauri, where would the sun appear to be in the sky?
29. [Updated]How close together are stars in a star cluster?
30. [Updated]What are the colors of the stars in the Big Dipper?
31. What is a red giant star?
32. Why aren't there any green stars?

---

33. What happens to the dust in a forming solar system?
34. What is the range in masses for stars?
35. How do astronomers determine the size and distances of stars?
36. Why isn't Ophiuchus a zodiacal constellation?
37. Where can I get information about the constellations, specifically Ursa major?
38. Relative to the size of our solar system, how close together are stars in globular clusters?
39. Can we see individual stars that are outside our galaxy?
40. How many constellations are there?
41. What is the Main Sequence?
42. How old are the oldest stars?
43. What is a starquake?
44. Do stars ever gain mass after they are formed?
45. Has the Hubble Space Telescope looked at any of the nearby stars?
46. Is there a minimum and a maximum size to stars and black holes?
47. How long does it take for stars to form?
48. Are there more grains of sand on the beach than stars in the universe?
49. How did people estimate the distances to stars using a candle and a pin hole?
50. What is the physical reason why we can't see stars in the daytime?
51. What is the magnitude of the faintest star you can see from a city with the naked eye?
52. What is the relationship between a star's color and its temperature?
53. Does the Hyades cluster in Taurus have a Messier number, and if not, why?
54. Exactly how do astronomers determine distances to stars using parallax?
55. Are sunspots seen on other stars always dark?
56. When a star burns out, what happens to its planets?
57. Is a brown dwarf a star or a planet?
58. Where can I get information about stellar spectral types, distances etc?
59. What is the largest distance between stars in a binary star system?
60. Can you see stars from the bottom of a well?
61. Are there any classification systems for planets and stars?
62. Can I have a star named after my wife on our anniversary?
63. How often do stars collide in the Milky Way?
64. How fast do stars move through space?
65. Why do some stars have spikes and points?
66. Can stars come in non-round shapes too?
67. Is there a constellation called 'The Head of Satan'?
68. What are the core temperatures of some stars?
69. Exactly how do stars form from gas clouds?
70. When the sun dies, will its planetary nebula produce a new star?
71. When did people discover exactly what stars were?
72. If a supernova happened 50 light years from Earth, would it outshine the Sun?
73. How would the constellations change if I traveled to Pluto, a nearby star, or the center of our galaxy?

Intermediate:

1. [Updated]Why do planetary nebulae have hourglass shapes?
2. [Updated]Who invented the stellar classification system 'OBAFGKM'?
3. [Updated]How do some stars make dust?
4. [Updated]Why do stars evolve?
5. [Updated]If stars come in all colors, why do they all appear white to the eye?
6. [Updated]Do all O-type stars become supernovae?
7. [Updated]What happens when two stars collide?
8. [Updated]What is a neutrino star?
9. [Updated]How can a white dwarf be associated with a star only a few 100 million years old?

---

10. How do astronomers use a spectrum to find out what gases are in a star?
11. How do you measure the age of stars and the universe?
12. How does dust and gas get into the sky to make stars?
13. By what process do supernovae become Type I or Type II?
14. What makes different stars age so differently?
15. How much hydrogen does a star need to shine, and does it fade as it gets older?
16. How can a white dwarf have the same mass as the Sun and not 'burn'?
17. What would happen to a planet orbiting a star that has supernovaed?
18. How are the distances to nebulae determined?
19. Why does the 'iron crisis' occur in pre-supernova stars?
20. How would a star loose enough mass to unbind the orbits of its planets?
21. Could you give a table of the number of stars in each magnitude interval to +8 in apparent magnitude?
22. If the Cepheid star method gives you luminosity, how do you then determine distance from this knowledge?
23. How can you tell a star has starspots when you can't even see the star's surface?
24. How do astronomers figure out the ages of stars?
25. What kind of terrestrial atmosphere would make stars look green?
26. If a star were to loose mass, what would happen to the orbits of planets?
27. If iron is the heaviest element created by stars, where did things like uranium and lead come from?
28. Are there any competing theories about how stars form?
29. What exactly happens to a star about to go supernova?
30. How do you compute the angular distance between two stars from their coordinates?