Space feed
Backward orbit
Triton circles Neptune in the opposite direction to the planet's rotation. This backward orbit is a major clue that Neptune captured its largest moon rather than forming it nearby.
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.