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Triton orbits Neptune backward

Neptune's largest moon, Triton, travels around the planet in the direction opposite Neptune's rotation.

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This retrograde orbit suggests that Triton did not form beside Neptune. Scientists think it was probably captured from the Kuiper Belt by Neptune's gravity.

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A day on Venus is longer than its year

Venus takes about 243 Earth days to rotate once but only about 225 Earth days to orbit the Sun.

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The space station sees about 16 sunrises a day

The International Space Station circles Earth roughly every 90 minutes, giving its crew about 16 sunrises and sunsets in 24 hours.

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Sunsets on Mars can appear blue

Near the setting Sun, fine dust in the Martian atmosphere can produce a blue glow instead of the red sunset familiar on Earth.

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