Planets are made up of mostly the same things as stars and moons, and with millions upon billions of them (we believe), it really is mind boggling to try and understand how many planets there are in the universe. Up
Astronomy: Tips for Exploring the Wonders of Outer Space from Home
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Galaxies
Universe
Observable Universe
Black Holes
Wormholes
Gravity
Time Travel
Planets
Planets are made up of mostly the same things as stars and moons, and with millions upon billions of them (we believe), it really is mind boggling to…