Last quarter: The moon has moved another quarter of the way around Earth, to the third quarter position. The sun's light is now shining on the other half of the visible face of the moon.
"It's half Pluto's size and 12% of its mass, which makes it much more similar to the Earth's moon than any other moon in the solar system." For comparison, our moon is just a quarter of the size ...
"We think the Earth-Moon system initiated when a Mars ... "And this collision scenario supports the formation of other moons, such as Pluto's four other tiny, lumpy satellites," she said.