Across
- 3. a Moon shape that is larger than a first or third quarter, but smaller than a full Moon.
- 4. system, a region of space with a system of objects orbiting a star (the solar system).
- 8. spectrum, all electromagnetic radiation arranged in order of energy level.
- 12. the force that pulls objects to a surface.
- 13. a planet orbiting a star other than our Sun.
- 14. an object that orbits a star and has its own gravity to force it to a spherical shape (Mars).
- 15. a change in land created by an impact (the Moon’s craters).
- 16. Star, the star pointed to by Earth’s North Pole.
- 18. of reference, the assemblage of objects, distances, and directions that you use to establish the location of something.
- 20. a representation of thinking to help others understand what you are saying.
- 21. a big collection of billions of stars, interstellar gas, and dust (the Milky Way)
- 23. fuel, the remains of organisms that lived long ago that were preserved.
- 26. Belt, the region of the solar system beyond the orbit of Neptune.
- 29. a rocky object that orbits the Sun.
- 31. eclipse, when the Earth is exactly between the Moon and the Sun.
- 32. light, wavelengths of electromagnetic radiation that can be seen by the human eye.
- 33. a cloud of gas and dust in space between stars.
- 34. a chunk of a material that is only a few kilometers in size.
- 36. Earth’s natural satellite.
- 37. period, how long it takes an object to orbit another object.
- 38. the dark surface of cooled magma in a flooded crater.
Down
- 1. a small- or medium-sized piece of rock or metal from space.
- 2. a layer of gases that surround an object (Earth’s atmosphere).
- 5. the path an object takes to orbit another object (Earth’s revolution around the Sun).
- 6. a collection of interacting parts.
- 7. light-colored areas of the Moon with lots of rough mountains and craters.
- 9. dwarf, the stage of a star when it has no more fuel for nuclear reactions.
- 10. the path an object takes when it travels around another object.
- 11. giant, the stage of a star when it becomes very large and has a relatively cool surface.
- 14. each different shape of the Moon (full Moon, first quarter, third quarter, new Moon).
- 17. something that has something to do with the Moon.
- 18. moon, the phase of the Moon when you can see the whole Moon when it’s white.
- 19. line, a bright line of a spectrum
- 22. an imaginary axle that a planet spins on.
- 24. crater, a crater with central peaks.
- 25. planet, a round planet that orbits the Sun (Pluto).
- 27. a day of the year when the Sun’s rays shine straight down the equator.
- 28. a streak of light in the sky from gravel- and pebble-sized meteoroids.
- 30. bang theory, the theory that one single explosion created the universe.
- 35. the total of all things that can be observed or detected.
- 36. Way, the name of the galaxy that our solar system is a part of.