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T5 Earth-Sun-Moon
5.1 Movement in Space
Term | Definition |
---|---|
constellations | a group of stars that forms a shape or pattern |
polaris | Name of the North Star |
circumpolar | describing any star that is always visible in the night sky |
ursa major | Seven of its stars form the Big Dipper. |
ursa minor | Constellation known as the Little Dipper that contains the star Polaris |
Orion | The most distinctive feature is a belt |
Betelgeuse | Red supergiant star in the Orion Constellation |
satellite | A body that orbits a planet |
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 |
meteor | A streak of light in the sky produced when a small object burns up in Earth's atmosphere. |
comet | A loose selection of ice and dust that orbits the sun, typically in a long, narrow orbit |
star | A ball of hot gas, primarily hydrogen and helium that undergoes nuclear fusion. |
geocentric | Term describing a model of the universe in which Earth is at the center of the revolving planets and stars first developed by Aristotle and further developed by Ptolemy. |
heliocentric | Term describing a model of the solar system in which Earth and the other planets revolve around the sun first developed by Aristarcus and further developed by Copernicus. |
ellipse | shape of the orbital path's planets take as calculated by Kepler |
Aristarchus | ancient Greek scientist who first developed a heliocentric model of our solar system |
Nicolaus Copernicus | further developed heliocentric saying Earth's rotation and revolution around the sun explained stars moving |
Johannes Kepler | Brahe's assistant who calculated the shape of a planet's orbit is an ellipse, not a circle. |
Tycho Brahe | observed that planets did not move in a circle around the sun. |
Galileo | proved the heliocentric model to be true since Jupiter has moons that revolve around it instead of Earth. |