In 1977, we received a signal from deep space that lasted 72 seconds. It is referred to as “6EQUJ5”. We still don’t know how or where it came from.

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Scientists think that a huge asteroid slammed into Mercury about 4 billion years ago, creating a giant crater about 960 miles (1,545 km) across.

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Most of what we know about Venus is derived from the intensive Soviet study of the planet.

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New Horizons carries a CD containing some 435,000 names of people who signed up online to send their names to Pluto.

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NASA has discovered over 3,200 planets, all confirmed with 99% certainty.

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The beautiful symmetry of a total solar eclipse happens because—by pure chance—the sun is 400 times larger than the moon but is also 400 times farther from Earth, making the two bodies appear the exact same size in the sky

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Uranus has the coldest planetary atmosphere in the solar system.

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Saturn’s moon Titan may harbor a very salty ocean.

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The dark side of the moon is actually turquoise.

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The Sun is the most perfectly round natural object in the universe.

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