Space
76 yrs
Halley's Comet returns about every 76 years, and its next visit is due in 2061.
Yes. Halley's Comet orbits the Sun about every 75 to 76 years. It last passed closest to the Sun in 1986, and its next return is expected in 2061.
Halley's Comet returns about every 76 years, and its next visit is due in 2061.
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Space
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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