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Lesson 11-1
Movement in Space
| Term | Definition |
|---|---|
| Aristarchus | about 270 BCE Ancient Greek who first developed a heliocentric model (sun centered) |
| comet | a loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit |
| constellation | a pattern or grouping of stars that people imagine to represent a figure or object |
| Copernicus | 1543 CE -Stated Earth's rotation and revolution around sun explain stars moving. |
| ellipse | an oval shape, which may be elongated or nearly circular; the shape of the planets' orbits |
| Galileo | 1610 CE-Heliocentric model of the solar system (sun is at the center with planets orbiting around) |
| geocentric | term describing a model of the universe in which Earth is at the center of the revolving planets and stars |
| heliocentric | term describing a model of the solar system in which Earth and the other planets revolve around the sun. |
| Kepler | 1605 CE -This astronomer stated that the orbits of planets around the sun were elliptical (oval), not a circle |
| meteor | a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere |
| planet | an object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit. |
| Ptolemy | 140 CE Geocentric model of solar system (Earth centered) |
| satellite | an object that orbits a planet |
| star | a ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion |
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