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Mars is slowly pulling its moon Phobos in

Phobos draws about six feet closer to Mars every hundred years.

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At that rate the moon will either crash into Mars in 50 million years or break up into a ring. Its most prominent feature is Stickney crater.

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Parker Solar Probe flies at 430,000 mph

At its closest approach to the Sun, Parker Solar Probe travels at about 430,000 miles per hour.

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A canyon on Mars would span the United States

Valles Marineris on Mars is long enough to stretch from California to New York.

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Comets have two tails

A comet has two tails, one of dust and one of ionized gas.

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