Space
165
One year on Neptune lasts about 165 Earth years.
Yes. Neptune takes about 165 Earth years to orbit the Sun once. Since its discovery in 1846, it has completed only one full orbit, finishing in 2011.
One year on Neptune lasts about 165 Earth years.
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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.
Space
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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