| A | B |
|---|
| absorption | light stopped by an object |
| asteroid | objects revolving around the sun that are too small and too numerous to be considered planets |
| black hole | the remains of an extremely massive star pulled into a small volume by the force of gravity |
| comet | a ball of ice and dust whose orbit is usually a long, narrow ellipse |
| equinox | the two days of the year on which neither hemisphere is titled toward or away from the sun |
| fusion | when two nuclei (atoms) combine to create a heavier new atom (ex: hydrogen combine to make helium) |
| lunar eclipse | the blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon |
| meteor | a streak of light in the sky produced by the burning onf a meteoroid in Earth's atmosphere |
| meteorite | a meteoroid that has hit Earth's surface |
| nebula | a large amount of gas and dust in space, spread out in an immense volume |
| planet | a spherical ball of rock and/or gas that orbits around a star |
| reflection | light that hits an object and bounces off in a new direction |
| refraction | light that gets bent as it goes through a new substance/medium |
| revolution | the movement of an object around another object |
| rotation | the spinning motion of an object about its own axis |
| solar eclipse | the blocking of sunlight to Earth that occurs when the moon is between the sun and Earth |
| star | a giant ball of hot gas that creates and emits its own radiation through nuclear fusion |
| summer solstice | the first day of summer; when the sun is drectly overhead at 23.5 degrees North |
| supernova | the explosion of a dying giant or supergiant star |
| tide | the rise and fall of the level of water in the ocean causes by the gravitational pull of the moon |
| transmission | light going straight through an object |
| winter solstice | the first day of winter; when the sun is drectly overhead at 23.5 degrees South |
