Across
- 3. A device sent into space to gather information and explore space.
- 5. Huge collections of stars.
- 6. The daily rise and fall of the sea level.
- 12. A rotating disk of gas and dust surrounding a newly formed star.
- 15. A cloud of gas and dust.
- 17. The theory that states that the universe started at one point and has been expanding ever since.
- 20. A graph that plots the relationship between a star’s luminosity and its temperature.
- 22. An instrument that spreads light into different wavelengths.
- 24. The distance that light travels in 1 year.
- 25. A huge explosion that destroys a star.
- 26. A hot and dense, slowly cooling sphere of carbon.
Down
- 1. Everything that exists.
- 2. The path that an object follows as it moves around a different object.
- 4. A spiral galaxy that our solar system is located in.
- 7. The shift to a different wavelength on the electromagnetic spectrum.
- 8. When the nuclei of several atoms combine, and they make one larger nucleus.
- 9. The amount of matter that is in an object.
- 10. The gravitational force exerted on an object.
- 11. An attractive force that is between all objects that have mass.
- 13. An instrument that is designed to make far away objects appear closer, either with lenses (refracting), or with mirrors (reflecting).
- 14. A moon, planet, or machine that orbits a planet or star.
- 16. A large ball of gas held together with gravity. Its core is so hot that nuclear fusion can occur.
- 18. It occurs just after the full or new moon, and the tide is larger.
- 19. It occurs when the moon is in the first or third quarter, and the tide is smaller.
- 21. An object where its gravity is so great that no light can escape.
- 23. A spectrum of electromagnetic radiation emitted by a source.