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Space Vocabulary
Part 1
| Term | Definition |
|---|---|
| Asteroid | Metallic, rocky objects without atmospheres that orbit the Sun but are too small to be classified as planets or dwarf planets. |
| Galaxy | A group of billions of stars held together by gravity |
| Comet | Small objects primarily made of dust and ice that orbit the Sun. |
| Nebula | A giant cloud of dust and gas in space. |
| Dwarf planet | A celsdtial body that orbits a star, has enough mass to be a sphere, HAS NOT cleared its orbit of smaller objects, and is not be a moon. |
| Star | Giant collection of glowing gases at high temperatures. |
| Light year | A measure of the DISTANCE light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year. |
| Astronomical Unit (AU) | a measure of the average distance of Earth from the sun. That’s about 93 million miles, 150 million kilometers … or about 8 light-minutes. |
| Solar system | Approximately 4.5 billion years old- consists of the Sun, planets, moons, meteors, asteroids, comets and dwarf planets. |
| Space | The three-dimensional expanse in which all matter exists. |
| Moon | The only natural satellite of Earth that rotates around Earth every 27.3 days, and rotates around itself every 27.3 days as well. |
| Universe | A term that means everything. It includes all of space, and all the matter and energy that space contains. It even includes time itself and, of course, it includes you. |
| Planet | A celestial body that meets 3 criteria: needs to orbit a star, be big enough that its own gravity shapes it as a sphere, be small enough that it isn’t a star itself, and have cleared its orbit of smaller objects. |
| Meteors | Meteroids that enter Earth's atmosphere, forming bright streaks across the sky. |
| Satellite: | Object that orbits a larger object |
| Sun | A sphere, composed almost entirely of the elements hydrogen and helium that we revolve around. |
| Meteoroids | Meteors before they reach Earth’s atmosphere. |
| Meteorites | Leftover meteors that don’t burn up completely, and manage to strike Earth. They provide important scientific information. |
| Exoplanets | Panets orbiting stars other than our Sun. They are found in solar systems other than our own. |
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