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19 Cards in this Set
- Front
- Back
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The Sun's nearest neighboor, Proxima Centauri, is approximately 4.2 light-years away from Earth. How long does it take for light to travel from Proxima Centauri to Earth? speed of light=3X10^5, 1 light year=10^13 km
1. 1.4 years 2. 12.6 x 10^5 years 3. 4.2 years 4. I don't know |
3. 4.2 years
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Used to compare objects of different sizes. In astronomy, this ranges from interior of atoms to the edge of the observable universe.
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scale
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A vast region of the universe that appears to be mostly devoid of normal matter and even dark matter
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Void
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large, glowing ball of gas that generates energy through nuclear fusion in its core
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Star
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This is our source of gravity, light, and solar wind
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Our star, the sun
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Holds objects in orbit, defines size and shape of solar system
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Gravity
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Solar system objects seen with sunlight reflected from their surfaces/clouds.
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Light
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Flow of charged particles that have escaped the Sun and interact with magnetic fields, atmospheres, and surfaces of solar system objects
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Solar wind
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Our solar system consists of...
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-Eight planets and their moons
-Dwarf planets -Small solar system objects -Interplanetary dust |
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A celestial body that is in orbit around the Sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and has cleared the neighborhood around its orbit
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A classical planet
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A celestial body that is in orbit around the Sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, has not cleared the neighborhood around its orbit, and is not a satellite
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Dwarf planet
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All objects orbiting the Sun besides classical and dwarf planets
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small solar system bodies
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Pluto, Eris, and Ceres are all...
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Dwarf planets
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Object that orbits a planet
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Moon (or satellite)
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Small solar system objects include...
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asteroids, meteoroids, comets, and trans neptunian objects (TNO's)
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Relatively small, rocky/metallic object that orbits a star.
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Asteroid
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Very small, rocky/metallic object that orbits a star. Possibly collision debris from asteroids and/or planets
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Meteoroid
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Relatively small, icy object that orbits a star
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Comet
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Trans Neptunian Objects (TNO's)
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Icy objects orbiting the Sun beyond the orbit of Neptune
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