irregularly shaped planetary body, ranging from 6 meters (20 feet) to 933 kilometers (580 miles) in diameter, orbiting the sun between Mars and Jupiter.
the study of space beyond Earth's atmosphere.
celestial object made up of ice, gas, and dust that orbits the sun and leaves a tail of debris.
celestial body that is nearly spherical but does not meet other definitions for a planet.
our planet, the third from the Sun. The Earth is the only place in the known universe that supports life.
one of the four enormous outermost planets in the solar system (Jupiter, Saturn, Neptune, Uranus), composed mostly of gases instead of rock. Also called a Jovian planet.
measure of the amount of matter in a physical object.
natural satellite of a planet.
path of one object around a more massive object.
large, spherical celestial body that regularly rotates around a star.
"main sequence" star with huge surface area, low surface temperature, and reddish color.
the sun and the planets, asteroids, comets, and other bodies that orbit around it.
large ball of gas and plasma that radiates energy through nuclear fusion, such as the sun.
star at the center of our solar system.
space an object occupies.
small, dense "main sequence" star that has used up most of its nuclear fuel.