Space

2. bodies that have a particular shape
3. bang theory- an explanation of the origin of the universe stating that it started small and expanded over billions of years
7. factor- a method of reducing all measurement by the same amount to achieve the proportions of the scale model
8. a celestial body moving in an elliptical orbit around a star
10. planet- a celestial body resembling a small planet by lacking certain technical criteria that are required for it to be classed as such
12. of relativity- the basic idea is that instead of being an invisible force that attracts objects to one another, gravity is a curving or warping of space. The more massive an object, the more it warps the space around it
15. The branch of science that studies the stars, planets, and other objects in space
16. an imaginary line that runs through the middle of an object around which that object rotates
20. system- a collection of eight planets and their moons in orbit around the sun, together in smaller bodies in form of asteroids, steroids, and comets
21. a celestial object consisting of nucules of ice and dust and, when near the sun, a tail of gas and dust particles pointing away from the sun

1. model- Modern view of the universe that places the sun at the center and their planets and their moons revolve around the sun
4. A large system of dust, gas, stars, and other
5. main types of galaxies- most fall into one of three categories,
6. model- a description of the universe that placed the earth at the center and the sun, moon, stars, and all the planets revolve around the earth
7. a natural luminous body visible in the sky especially at night
9. year- the distance that light travels in one year
11. a natural satellite of the earth, visible by reflected light from the sun
13. elliptical or irregular
14. the total amount of matter in an object
17. a natural or artificial object that orbits another object in space
18. belt- a tours shaped region in the solar system, located roughly in between the orbits of the planets Jupiter and Mars, that is occupied by a great many solid, irregularly shaped bodies, of many sizes but match smaller than planets, called asteroid or minor planets
19. The curved path of an object such as a planet or moon around a central object, such as a star or a planet, to move in a circular or elliptical path around the object