The Solar System is the gravitationally bound system comprising the Sun and the objects that orbit it, either directly or indirectly. Of those objects that orbit the Sun directly, the largest eight are the planets, with the remainder being significantly smaller objects, such as dwarf planets and small Solar System bodies. Of the objects that orbit the Sun indirectly, the moons, two are larger than the smallest planet, Mercury. 

The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant interstellar molecular cloud. The vast majority of the system's mass is in the Sun, with the majority of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, are terrestrial planets, being primarily composed of rock and metal. The four outer planets are giant planets, being substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are gas giants, being composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are ice giants, being composed mostly of substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane. All eight planets have almost circular orbits that lie within a nearly flat disc called the ecliptic.

What are the answers to this following set of questions:

1. When was the Solar System formed?
2. From what?
3. What is the Solar System?
4. What are the largest eight things orbiting the sun?
5. What are some of the smaller things?
6. Where is most of the Solar System's mass?
7. Which planet has most of the rest of the mass?
8. How many inner planets are there?
9. What are two of them?
10. What are the other two?
11. What kind of planets are they?
12. What are they mostly made up of?
13. Which planets are the ice giants?
14. Which are gas giants?
15. What are there names?
16. How many outer planets are there?
17. What kind of orbit do all of the eight planets have?
18. Which things orbit the sun indirectly?
19. What are Uranus and Neptune made up of mostly?
20. What is the name for the nearly flat disc?

Numbered answers:
1. 4.6 billion years ago
2. a giant interstellar molecular cloud.
3. a gravitationally bound system comprising the Sun and the objects that orbit it,
4. planets
5. dwarf planets
6. the Sun
7. in Jupiter.
8. Four
9. , Mercury, Venus
10. Earth and Mars,
11. terrestrial planets,
12. rock and metal.
13. Uranus and Neptune,
14. The two largest,
15. Jupiter and Saturn,
16. The four outer planets
17. lmost circular
18. .moons
19. substances with relatively high melting points compared with hydrogen and helium, called volatiles, such as water, ammonia and methane.
20. the ecliptic.