| A | B |
|---|
| summer solstice | Longest day of the year. June 21-22 |
| winter solstice | Shortest day of the year. December 21-22 |
| equinox | EQUAL hours of day and night. This happens twice a year |
| galaxy | A group of billions of stars |
| satellite | An object that orbits a larger object |
| black holes | Dense, invisible objects in space |
| solar system | The sun and all the planets that revolve around it |
| astronomy | The study of space |
| meteorology | The study of weather |
| density | The mass of a given volume. Density = Mass/Volume |
| solar eclipse | When the moon is between the sun and the Earth |
| lunar eclipse | When the Earth is between the sun and the moon |
| phases | The moon's changing shapes |
| Stratus clouds | Low clouds that look like smooth sheets or a gray blanket. Cause drizzle, rain, or snow |
| Cirrus clouds | High clouds that have wispy, curled edges. They are so high and cold that they are made out of ice crystals. The signal a change in the weather is going to occur |
| Altocumulus clouds | Small patches arranged in bands across the sky |
| Cumulonimbus | Vertical clouds. Rise to great heights and often produce thunderstorms. |
| Water cycle | evaporation->condensation->precipitation->transportation |
