Chapter 21 Study Guide - The Solar System
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25 terms
Terms | Definitions |
|---|---|
 Photosphere | When you look at an image of the sun, you are actually looking at the ________________. |
| Solar wind | The _________is a stream of electrically charged particles that extend outward from the sun's corona. |
| heliocentric | In a ______________, earth revolves around the sun. |
| inner planets | All of the _____________ are small and have rocky surfaces. |
| Astronomers | __________ predicted the existence and orbit of Neqtune based on Neptune's gravitational effect on the orbit of Uranus. |
| comets | The orbits of most ________ are in the shape of long narrow ellipses. |
| asteroid belt | The __________ is located between Mars and Jupiter. |
| Meteoroids | ___________ usually come from comets or asteroids. |
| Meteor | When a meteoroid enter Earth's atmosphere, it produces a streak of light called a __________. |
| Venus and Earth | ________________ are much alike in terms of their size and density. |
| Saturn's rings | ____________ are made up mostly of chunks of ice and rock. |
| Uranus | ___________ is different from most other planets because it rotates on its side. |
| Jupiter | ____________ is the largest and most massive planet. |
| Ancient Astronomers | Most _________________ thought that all celestial objects revolved around Earth. |
| Nuclear fusion | ______________ occurs in the core or center of the sun. |
| Pluto | _________ was formerly consedered to be a planet but is now classified as a dwarf planet. |
| coma | A comet's head consists of a nucleus and a fuzzy outer layer called the ______________. |
| meteorite | A meteoroid that hits Earth's surface is called a ____________. |
| halo | The sun's corona, which looks like a ________ can usually be seen only during a solar eclipse. |
| hydrogen and helium | The gas giants are composed mainly of ______________. |
| flowing water | Regions on the surface of mars have patterns that appear to have been made by _____________. |
| geocentric model | An Earth centered model of the universe is called a ____________. |
| carbon dioxide | Mar's atmosphere is mostly _______________. |
| great red spot | Jupiter's _____________ is a storm larger than Earth. |
| chromospher | The middle layer of the sun's atmosphere is the ___________. |
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