the perspective of the universe focusing on the Earth as the center of the universe
the perspective of the solar system focusing on the Sun as the center.
a large system of dust, gas, and stars that has a particular shape
Astronomical Unit (AU)
the unit of measure equal to the Earth's distance from the Sun. The Earth is 1 AU (150 million km) from the Sun.
the study of the stars, planets, and other objects in space.
the spinning of an object around a central axis.
the orbiting of one object around another