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Stack #4654188
| Question | Answer |
|---|---|
| solar system | a star and all the celestial objects—planets, moons, asteroids, comets, and dust—that are bound to it by gravity and orbit around it. |
| planet | a large, round celestial body that orbits a star (like our Sun) and does not produce its own light. |
| star | a massive, luminous, and roughly spherical body of plasma (electrically charged gas) held together by its own gravity. |
| galaxy | a massive, gravitationally bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter. |
| light-year | the distance light travels in a vacuum in one Julian year (365.25 days). |
| universe | the totality of all space, time, matter, and energy that exists. |
| solstice | an astronomical event occurring twice annually (June and December) when the Sun reaches its highest or lowest point in the sky at noon, directly overhead the Tropics of Cancer or Capricorn. |
| star | a massive, luminous, and roughly spherical body of plasma held together by its own gravity |
| apparent magnitude | a measure of how bright a star, planet, or other celestial object looks to an observer on Earth. |
| luminosity | the total amount of light or energy an object (like a star or light bulb) produces every second. |
| absolute magnitude | of an astronomical object's intrinsic brightness (luminosity), defined as the apparent magnitude a star or object would have if placed at a standard distance of 10 parsecs ( light-years) from Earth. |