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
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see this FAQ.
NEW! Voice Recording
Click the mic to start.