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19 Cards in this Set

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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
Used to compare objects of different sizes. In astronomy, this ranges from interior of atoms to the edge of the observable universe.
scale
A vast region of the universe that appears to be mostly devoid of normal matter and even dark matter
Void
large, glowing ball of gas that generates energy through nuclear fusion in its core
Star
This is our source of gravity, light, and solar wind
Our star, the sun
Holds objects in orbit, defines size and shape of solar system
Gravity
Solar system objects seen with sunlight reflected from their surfaces/clouds.
Light
Flow of charged particles that have escaped the Sun and interact with magnetic fields, atmospheres, and surfaces of solar system objects
Solar wind
Our solar system consists of...
-Eight planets and their moons
-Dwarf planets
-Small solar system objects
-Interplanetary dust
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
A classical planet
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
Dwarf planet
All objects orbiting the Sun besides classical and dwarf planets
small solar system bodies
Pluto, Eris, and Ceres are all...
Dwarf planets
Object that orbits a planet
Moon (or satellite)
Small solar system objects include...
asteroids, meteoroids, comets, and trans neptunian objects (TNO's)
Relatively small, rocky/metallic object that orbits a star.
Asteroid
Very small, rocky/metallic object that orbits a star. Possibly collision debris from asteroids and/or planets
Meteoroid
Relatively small, icy object that orbits a star
Comet
Trans Neptunian Objects (TNO's)
Icy objects orbiting the Sun beyond the orbit of Neptune