Pale Blue Dot
This term refers to the appearance of Earth in a certain photo taken from a great distance away.
This is a set of galaxies.
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.
Four planets are known to have this feature, but it is not known why.
All planets except two have this feature.
SETI scans radio waves to search for these.
This planet is the second from the sun.
This planet is the fourth from the sun.
This planet is the fifth from the sun.
This planet is the sixth from the sun.
This planet is the seventh from the sun.
This planet is the eighth from the sun.
The author describes three...
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