Oort Cloud

2. A dwarf planet often used as a distance reference point
4. The theoretical edge of the solar system defined by the Oort Cloud
6. Cosmic material that may exist alongside icy objects in the cloud
8. The vast environment where the Oort Cloud resides
13. A large supply or source; often used to describe the cloud's function
15. A protective or encompassing layer; describes the cloud's structure
16. Describes the distant reaches of the solar system where the cloud is found
17. First name of the astronomer the cloud is named after
18. Adjective describing the cold composition of objects in the cloud
20. The profession of Jan Oort

1. Small icy bodies often described as the building blocks of planets
3. The surname of the Dutch astronomer who hypothesized this region
5. A belt of icy objects situated closer to the Sun than the Oort Cloud
7. A term sometimes used for the scattered remnants in the cloud
9. The approximate magnitude (in billions) of icy bodies contained within
10. The fundamental force that keeps the Oort Cloud objects within the Sun's influence
11. The curved path taken by comets orbiting the Sun
12. an icy body with a highly eccentric orbit originating from this cloud
14. The geometric shape of the Oort Cloud
19. The star that the Oort Cloud surrounds