sidereal day
scale
light year
astronomical unit
Theory
axis
Model
rotation
the time for one complete rotation of the earth relative to the Sun, about 4 minutes shorter than a mean solar day 23 hours 56 minutes
the distance that light travels in one year; about 9.46 trillion kilometers
spinning motion of a body around an axis
an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates
a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly.
specify a percentage of original size to enlarge or reduce the size of an object.
a hypothesis that has been tested with a significant amount of data
the average distance between the earth and the sun
