Across
- 3. The temperature of a star determines this.
- 4. A system of millions or billions of stars.
- 6. A light year is a unit of ____________.
- 8. The brightness of an object in space compared to our Sun.
- 10. A scatter plot of stars.
- 13. Electromagnetic radiation found all over the Universe left over from its creation.
- 14. Galaxies are held together by this kind of attraction.
- 15. This star has a luminosity of 1.
- 16. All of space and all the matter space contains.
- 17. When a comet gets close to a star, this gas and dust is visible.
- 18. An object made of ice and dust.
- 21. What a light year is measured in.
- 24. Measured for stars in units of Kelvin.
- 25. Theory that the Universe began from a very hot and compressed point that expanded rapidly.
- 26. An area of space have a gravitational field so intense that no matter or radiation can escape.
Down
- 1. Causes the release of light and heat from a star.
- 2. A group of smaller stellar objects pulled into orbit around a star.
- 5. Shows the color of a star.
- 7. Massive ball of gas held together by gravity.
- 9. A black hole is formed when one dies.
- 11. Lowest temperature possible.
- 12. Used to detect electromagnetic radiation.
- 19. A cloud of gas and dust in outer space.
- 20. How far light travels in one year.
- 22. A small rocky object orbiting the Sun or other star.
- 23. The group into which a star is classified based on color.