Pale Blue Dot - This term refers to the appearance of Earth in a certain photo taken from a great distance away.
Universe - This is a set of galaxies.
Cosmos - This term encompass everything that exists.
The Solar System - This is the star system that the Earth is located in.
Voyager 1 and 2 - These are robotic spacecraft launched in 1977.
Rings - Four planets are known to have this feature, but it is not known why.
Moons - All planets except two have this feature.
Aliens - SETI scans radio waves to search for these.
Venus - This planet is the second from the sun.
Mars - This planet is the fourth from the sun.
Jupiter - This planet is the fifth from the sun.
Saturn - This planet is the sixth from the sun.
Uranus - This planet is the seventh from the sun...
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