Quiz
1. How far have spacecraft from Earth traveled into space?
2. How have astronomers learned most of what they know about the stars, galaxies, and the universe?
3. If you could travel in a space ship at the speed of light away from the solar system, how long could you see the sun?
4. Approximately how many stars does the Andromeda Nebula contain?
5. Where do most of the known asteroids orbit the Sun?
6. How long has light traveled from the most distant galaxy we have observed?
7. How old is the earth?
8. How fast does the sun travel around the center of the galaxy?
9. To reach another planet, a spacecraft must be aimed:
10. A brown dwarf:
1. How far have spacecraft from Earth traveled into space?
Somewhat less than one Light-day.
2. How have astronomers learned most of what they know about the stars, galaxies, and the universe?
By analyzing light and other electromagnetic radiation from space that reaches the vicinity of Earth.
3. If you could travel in a space ship at the speed of light away from the solar system, how long could you see the sun?
30 years.
4. Approximately how many stars does the Andromeda Nebula contain?
100,000,000,000.
5. Where do most of the known asteroids orbit the Sun?
Between the orbits of Mars and Jupiter.
6. How long has light traveled from the most distant galaxy we have observed?
20,000,000,000 years.
7. How old is the earth?
5,000,000,000 years.
8. How fast does the sun travel around the center of the galaxy?
150 miles/second.
9. To reach another planet, a spacecraft must be aimed:
Where the planet will be when the spacecraft reaches it.
10. A brown dwarf:
Is similar to each of the above.