... Apollo 17: Boulder on the Moon . ... Twenty five years ago humans roamed the Moon. ... Rivers in the Sun . ... These fleeting events are only visible to those in the path of the Moon's shadow as it races across the Earth. Dark Sky, Bright Sun . ... In low Earth orbit there is not enough atmosphere to diffuse and scatter sunlight, so shadows are black and the sky is dark - even when the Sun shines. ... Five hundred light years from Earth, in the constellation Aquarius, a sun-like star is dying. ...