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Mars has a canyon system about 4,000 kilometers long, roughly ten times longer than the Grand Canyon.

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A Viking orbiter mosaic of Mars showing the long scar of Valles Marineris
Space

4,000 km

Mars has a canyon system about 4,000 kilometers long, roughly ten times longer than the Grand Canyon.

Yes. Valles Marineris on Mars runs for more than 4,000 kilometers, reaches depths of around 7 kilometers and is up to about 200 kilometers wide. The Grand Canyon is about 446 kilometers long and under 2 kilometers deep.

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Venus from Mariner 10
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243 days

A rotation on Venus takes longer than its entire year.

Venus takes about 243 Earth days to rotate relative to the stars, longer than its 225-day year. Its solar day, measured from one sunrise to the next, is shorter: about 117 Earth days.

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Moving heart of the Crab Nebula
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1B tons

A teaspoon of neutron star would weigh about a billion tons.

A teaspoon-sized volume at neutron-star densities can have a mass of roughly a billion tons. This is a density comparison, not a suggestion that stable spoonfuls could be brought to Earth.

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