When you think about planets and moons that resemble Earth, you’d probably think of Venus, Mars, or the Moon. But if you’re ...
Related: How we landed a probe on another planet's moon But Titan's diameter is only 40 percent that of Earth, and it has less than 2.3 percent of Earth's mass. With this in mind, how can it hold ...
The ringed giant's moons also vary considerably in size. The largest, Titan, is bigger than the planet Mercury, while the smallest is no larger than a sports arena, according to NASA. Seven of ...