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Stack #4664634
| Question | Answer |
|---|---|
| geocentric | Term describing a model of the universe in which earth is at the center of revolving planets and stars |
| heliocentric | Term describing a model of the solar system in which earth and other planets revolve around the sun |
| ellipse | An oval shape which may be elongated or nearly circular: the shape of a planet's orbit |
| solar system | The system consisting of sun and the planets and other objects that revolve around it |
| astronomical unit | A unit of distance equal to the average distance between earth and the sun, about 150 million kilometers |
| planet | An object that orbits a star, is large enough to become rounded by it's own gravity, and has cleared the area of it's orbit |
| dwarf planet | An object that orbits the sun and is spherical, but has not cleared the area of it's orbit |
| planetesmial | One of the small asteroid-like bodies that form the building blocks of the planet |
| core | The central region of the sun, where nuclear fusion takes place |
| nuclear fusion | The process in which two atomic nuclei combine to form a larger nuclear, forming a heavier element and releasing huge amounts of energy: the process in which energy is produced in stars |
| radiation zone | A region of very tightly packed gas in the sun's interior where energy is transformed mainly in the form of electromagnetic radiation |
| convection zone | The outer most layer of the sun's atmosphere |
| photosphere | The inner layer of the sun's atmosphere that gives of it's visible light: the sun's surface |
| chromosphere | The middle layer of the sun's atmosphere |
| corona | The outer layer of the sun's atmosphere |
| solar wind | A stream of electrically charged particles that emanate the sun's corona |
| sunspot | A dark area of the gas on the sun's surface that is cooler than the surrounding gases |
| prominence | A huge, reddish loop of gas that protrudes from the sun's surface, linking parts of sunspot regions |
| solar flare | An eruption of gas from the sun's surface that occurs when loops of sunspot regions suddenly connect |
| terrestrial planet | The names often given to the four inner planets: Mercury, Venus, Earth, and Mars |
| greenhouse effect | The trapping of heat near a planets surface surface by certain gases in the planet's atmosphere |
| gas giant | The names often given to the outer planets: Saturn, Jupiter, Uranus,and Neptune |
| ring | A thin disk of small ice and rock particles surrounding a planet |
| asteroid belt | The region of the solar system between the orbits of Mars and Jupiter, where many asteroid are found |
| Kuiper belt | A region where many small objects orbit the sun and that stretches from beyond the orbit of Neptune ti about 100 times Earth's distance from the sun |
| oort cloud | A spherical region of comets that surrounds the solar system |
| comet | A loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit |
| coma | The fuzzy outer layer of a comet |
| necleus | The solid inner core of a comet |
| asteroid | One of the rocky objects revolving around the sun that are too small and numerous to be considered a planet |
| meteoroid | A chunk of rock or dust in space, typically smaller than a asteroid |
| meteor | A streak of light in the sky typically produced by the burning of a meteoroid in the Earth's atmosphere |
| meteorite | A meteoroid that passes through the Earth's atmosphere and hits Earth's surface |
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