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Science Vocabulary
Chapter 15 Vocabulary Words
Term | Definition |
---|---|
Rotation | The spinning of Earth around its axis |
Orbit | A curved path |
Revolution | The movement of Earth around the Sun |
Lunar Highlands | The mountainous areas of the Moon |
Maria | The smooth dark regions of the Moon |
Eclipse | The Moon's shadow travels across parts of Earth |
Tides | A alternate rise and fall in sea level |
Solar System | A system made of eight planets and numerous other objects that orbit the Sun, all held in place by the Sun's immense gravity |
Astronomical Unit- | A unit of measure that equals 150 million km, which is the mean distance between the Earth and the Sun |
Comet | A large body of ice and rock that travels around the Sun in an elliptical orbit |
Meteorites | Any fragments from space that survive there plunge through the atmosphere and land on Earth's surface |
Constellations | Groups of stars that form patterns in the sky |
Supernova | An exploding star |
Galaxy | Groups of stars, gas, and dust held together by gravity |
Light year | The distance light travels in one year |