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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.

Neptune

This planet is the eighth from the sun.

Catastrophe

The author describes three...

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