a star system with two stars
a binary star system in which one star periodically blocks the light from the other
a star cluster that has a loose, disorganized appearance and contains no more than a few thousands
a large, round, densely-packed grouping of older stars
a huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern
a galaxy shaped like a round or flattened ball, generally containing only old stars
a galaxy that does not have a regular shape
an enormously bright, distant galaxy with a giant black hole at its center
all of space and everything in it
a mathematical method of writing numbers using powers of ten
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.