Celestial Objects Flashcards
Galaxy
A large grouping of stars. Galaxies re found in a variety of sizes and shapes.
Solar System
A system of planets, moons, asteroids, comets, dust, gas and any other objects that orbit a star, tied to it by the star’s gravitational force.
Star
A giant ball of plasma which is carrying out nuclear fusion and therefore emits radiation.
Planet
body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, but is not massive enough to cause thermonuclear fusion. It must also have cleared its neighboring region from all debris.
Satellite
A natural or artificial body in orbit around a planet.
Asteroid
A small planetary body I’m orbit around the Sun, which is smaller than a planet. Most asteroids can be found in a belt between the orbit of Mars and Jupiter. The orbits of some asteroids take them close to the Sun, which also takes them across the paths of the planets.
Metroid/Meteor/Meteorite
A meteoroid is a small rocky or metallic body in outer space. Meteoroids are significantly smaller than asteroids, and range in size from small grains to one-meter-wide objects.
Comet
A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.