| A | B |
|---|
| annular eclipses | occurs when the moon is farthest from the earth |
| Mercury | this planet has no moons |
| Pluto | this body is neither terrestrial nor gaseous; it is no longer considered a planet |
| gas giants | planets that have ring systems |
| annular eclipses | occur when the moon is too far way from the earth to completely hide the sun |
| astronomical unit | the average distance between earth and the sun |
| light-years | the measurement used to measure distance between stars |
| Mercury | occupies the first orbit away from the sun |
| Earth | the third planet away from the sun |
| Mars | the fourth planet away from the sun |
| Venus | the second planet away from the sun |
| Jupiter | the fifth planet away from the sun |
| Neptune | the eighth planet away from the sun |
| Saturn | the sixth planet away from the sun |
| period of rotation | the amount of time it takes for an object to spin on its axis |
| period of revolution | the amount of time it takes for an object of orbit the sun once |
| prograde rotation | spinning in a counterclockwise direction |
| retrograde rotation | spinning in a clockwise direction |
| direction of revolution | the same for all planets |
| one period of revolution | equals 1 year for ALL planets |
| Venus | planet most similar to earth in density, size, and mass |
| Mars | the coldest inner planet |
| Great Red spot | a storm system on Jupiter |
| Jupiter | the largest planet |
| Mercury | smallest planet (not counting Pluto) |
| Saturn | planet with the largest rings |
| Uranus | the planet that is tipped on its side |
| lunar eclipse | the moon looks red during this event |
| annular eclipse | the solar corona is visible during this event |
| solar eclipse | the moon is between the earth and the sun |
| annular eclipse | occurs because the moon's orbit is not exactly circular |
| lunar eclipse | the earth comes between the sun and moon |
| annular eclipse | an event that can be viewed from only a few locations on earth |
