Space

2. A spherical shell of cometary bodies believed to surround the sun far behind the orbits.
4. bang theory An explanation of the origin of the universe stating that it started small and expanded over billions of years.
5. An object that contains ice and dust.
9. A natural or artificial object that orbits the space.
10. an invisible line around an object that rotates
11. Sysytem The collection of 8 planets that orbit the sun.
13. Calendar : The most widely accepted and used civil calendar internationally
15. An optical instrument that makes distant objects appear larger and brighter using lens or curved mirrors.
16. An invisible part of the electromagnetic spectrum that has a wavelength longer than the visible light. Most thermal, or heat, radiation is emitted from objects infrared spectrum.
19. A torus- shaped region that is located between Jupiter and Mars.

1. The branch of science that deals with space and the universe of a whole.
3. all of space and their contents
6. The amount of matter in an object.
7. A fixed point in the sky that emits light.
8. A body moving elliptical that orbits around the sun.
11. Factor A method for reducing all measurements by the same amount to achieve proportions of the scale model.
12. Model Modern view of the universe that places the Sun at the center and the planets and their moons revolve around the sun.
13. Collection in gas, dust, and stars and their solar system.
14. The distance that light travels in one year.
17. The curved path of one object, such as the planet or the moon, around a central object, such as a star or planet.
18. A satellite from the Earth that is reflected by the light from the sun.