Beyond Earth

2. They neither spiral nor elliptical
4. is a congregation of solar system, stars, dusts, and gases held together by gravity
7. are large groups of smaller galaxy clusters or galaxy groups and are among the largest known structures of the cosmos
9. are composed of alloys of iron and nickel
10. outer visible layer of the sun
12. is a spherical collection of stars that orbits a galactic core as a satellite
14. is a natural science which is the study of celestial objects
16. are composed of a mixture of stony silicate material and iron.
18. asteroids that orbits outside the outer solar system
19. most common type of meteorites

1. common type of galaxy
3. is a unit of length used informally to express astronomical distances
5. is a planet that orbits a star other than the Sun, a stellar remnant, or a brown dwarf
6. Stars including their creation, evolution ,and death
7. refers to group or stars within the galaxy that resembles each other in terms of age, spartial distribution, or chemical composition
8. is the cloud of gas that became the sun
11. used to study the features of the sun
13. are minor planets that circe the Sun in a region called the Asteriod Belt
15. are glowing fragment of rock matter in space that burn and glow upon entering the atmosphere of Earth.
17. is the large, dim region surrounding the entire galaxy