Sun & Stars

4. the distance light travels in one Earth year
6. a celestial object that orbits a planet
8. the force of attraction that keeps you on Earth, and Earth orbiting the Sun
9. the process of gaining mass slowly over time.
11. a collection of planets that orbit a star
13. a celestial object that orbits a star
14. parts of an object that we can use to describe and organize them. Ex: Color, temperature, shape
16. what an object is made of
17. 90% of stars that fuse Hydrogen into Helium

1. the amount of light an object gives off in a given amount of time, a measure of an objects brightness.
2. how bright a star LOOKS from Earth.
3. This is everything that we know; all matter and energy. many billions of years old.
5. a collection of solar systems, nebulae and dust that tends to spiral
7. the true brightness of a star based on size and temperature.
10. a cloud of dust and gas where stars and solar systems are born
12. a giant ball of plasma that is sustained by gravity and produces heat and light through nuclear fusion
15. the amount of matter an object has