Across
- 2. scientists who discovered cosmic microwave radiation
- 7. the distance light travels through space in one year
- 8. A graph which plots the temperature of a star against the luminosity of the star
- 10. A process that occurs in stars in which the nuclei of atoms are pushed together until they combine, releasing tremendous amounts of energy
- 11. A large cloud of gas and dust in space where stars and planets are formed
- 12. celestial body resembling a small planet but lacks the criteria
- 13. theoretical stellar remnant of a white dwarf
- 15. A large body of gas which is held together by gravity and emits light and energy through nuclear fusion
- 17. leftover radiation from the Big Bang or the time when the universe began
- 18. The brightness of a star
- 20. A large collection of stars, gas, and dust held together by gravity
- 21. Space and everything in it including all matter and energy
Down
- 1. A hot dense core of matter that remain from the collapse of a low mass star
- 3. Scientist who suggested the Big Bang Theory
- 4. A collection of planets and other objects that orbit a central star
- 5. A small, incredibly dense ball of packed neutrons left over from the collapse of a supergiant star
- 6. A stable star which is actively fusing hydrogen and is shown in a diagonal pattern within a H-R diagram
- 9. A gigantic explosion in which a high-mass star throws its outer layers into space leaving only its core
- 13. an invisible object which remains after the collapse of some supergiant stars, with gravity so great that visible light cannot escape it
- 14. A large star with low temperature and high brightness
- 16. a theoretical repulsive force that counteracts gravity and causes the universe to expand at an accelerating rate.
- 19. celestial body moving in an elliptical orbit around a star