Question
$8.00 Astronomy
- From Astronomy: General-Astronomy
- Closed, but you can still post tutorials
- Due on May. 07, 2009
- Asked on May. 05, 2009 at 04:18:14AM
Q:
1. What is the diameter of our Galaxy, the Milky Way?
2. How far from the center of the Galaxy is the solar system? What else besides stars are in the Galaxy?
3. What are some differences between Pop I and Pop II stars?
4. How does interstellar dust affect our observations of stars and the Milky Way?
5. How can we determine the Milky WayÂ’s mass?
6. If the universe were contracting instead of expanding, how would we know (what would the observations be)?
7. How are the orbits of stars in the disk of a spiral galaxy different from the orbits of stars in an elliptical galaxy?
8. Do the galaxies in our Local Group orbit in the same plane, equivalent to the planets in the solar system?
9. Will any of the galaxies in the Local Group eventually leave, flying off into intergalactic space?
10. What is a gravitational lens?
11. What causes redshift?
12. What is the cosmic microwave background? What is its origin?
13. What is the difference between a planet and a star?
14. What caused the cloud which would become our solar system to become denser in the center?
15. Describe how the size of a planet might affect its surface geology.
16. The Moon is in tidal lock (synchronous rotation) with Earth. How long is a lunar day (from sunrise to sunset)?
17. Describe the differences and similarities of Mercury and the Moon.
18. Describe what it would be like to stand on Mars without a spacesuit. What would kill you first?
19. Why does the Moon have so many craters and the Earth so few?
20. Io, the closest of Jupiter's large moons, orbits around Jupiter every two days (our moon takes 28 days to orbit Earth and Io's path around Jupiter is much larger than the path of our moon around Earth). Why does Io move so fast?
2. How far from the center of the Galaxy is the solar system? What else besides stars are in the Galaxy?
3. What are some differences between Pop I and Pop II stars?
4. How does interstellar dust affect our observations of stars and the Milky Way?
5. How can we determine the Milky WayÂ’s mass?
6. If the universe were contracting instead of expanding, how would we know (what would the observations be)?
7. How are the orbits of stars in the disk of a spiral galaxy different from the orbits of stars in an elliptical galaxy?
8. Do the galaxies in our Local Group orbit in the same plane, equivalent to the planets in the solar system?
9. Will any of the galaxies in the Local Group eventually leave, flying off into intergalactic space?
10. What is a gravitational lens?
11. What causes redshift?
12. What is the cosmic microwave background? What is its origin?
13. What is the difference between a planet and a star?
14. What caused the cloud which would become our solar system to become denser in the center?
15. Describe how the size of a planet might affect its surface geology.
16. The Moon is in tidal lock (synchronous rotation) with Earth. How long is a lunar day (from sunrise to sunset)?
17. Describe the differences and similarities of Mercury and the Moon.
18. Describe what it would be like to stand on Mars without a spacesuit. What would kill you first?
19. Why does the Moon have so many craters and the Earth so few?
20. Io, the closest of Jupiter's large moons, orbits around Jupiter every two days (our moon takes 28 days to orbit Earth and Io's path around Jupiter is much larger than the path of our moon around Earth). Why does Io move so fast?
$2.00
Answers1-6, first letting you know I’m not cosmologist
- This tutorial hasn't been purchased yet.
- Posted on May. 05, 2009 at 05:56:10AM
A:
Preview: ... he sun to make one revolution, and the sun is approximately 26,000 light-years away. Using this information and Kepler's Third Law, estimate the total mass of the galaxy, which would include this black hole. Be sure to use kg, seconds, and meters. How many solar masses is this amount?<br><br>Here is a step by step of what I have done so far:<br><br>1. Converted light years to meters, and years to seconds:<br><br>225 years = 7.10030834 × 10^15 secon ...
The full tutorial is about 376 words long .