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Astronomy Ch.2 vocab
Astonomy Test Chapter two vocabulary
Term | Definition |
---|---|
Corona | The outer layer of the sun's atmosphere |
Terrestrial Planets | The name given to the four inner planets: Mercury, Venus, Earth, and Mars |
Meteoroid | A chunk of rock or dust in space |
Prominence | A loop of gas that protrudes from the sun's surface, linking parts of sunspot regions |
Heliocentric | A description of the solar system in which all of the planets revolve around the sun |
Photosphere | The inner layer of the sun's atmosphere |
Comet | A ball of ice and dust whose orbit is usually a long, narrow ellipse |
Solar Wind | A steam of electrically charged particles produced by the sun's corona |
Solar Flares | An explosion of hydrogen gas from the sun's surface that occurs when loops in sunspot regions suddenly connect |
Meteor | A streak of light in the sky produced by the burning of a meteoroid in the Earth's atmosphere |
Ellipse | An elongated circle, or oval shape; the shape of the planets' orbits |
Geocentric | A description of the solar system in which all of the planets revolved around Earth |
Sunspot | A dark area of gas on the sun that is cooler than the surrounding gases |
Core | The central part of the sun, where nuclear fusion occurs |
Meteorite | A meteoroid that has hit Earth's surface |
Gas Giants | The name given to the first four outer planets: Jupiter, Saturn, Uranus, and Neptune |
Nuclear Fusion | The process by which hydrogen atoms join together to form helium, releasing energy |
Greenhouse Effect | The trapping of heat by a planet's atmosphere |
Chromosphere | The middle layer of the sun's atmosphere |
Asteroids | Objects revolving around the sun that are too small and too numerous to be considered planets |
Extraterrestrial Life | Life that arises outside of Earth |