Space feed
1969
Apollo tracks persist because the Moon lacks rain and wind, but millions of years is not a secure lifetime estimate. NASA reported newer evidence suggesting the tracks may disappear in tens of thousands of years.
243 days
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.
1B 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.