Space feed
5,268 km
Ganymede, the largest moon of Jupiter, is wider than Mercury. Its diameter is about 5,268 kilometers, compared with Mercury’s roughly 4,880 kilometers. That makes it the solar system’s largest moon, but not a planet and not the more massive of the two bodies.
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.