First, evidence has been discovered supporting a subsurface salt-water ocean at Pluto! It would have the right mass to account for how Pluto and its moon Charon interact with each other.

Elon Musk reveals more of his plan for Mars – In short, every 26 months (timed to coincide with the Earth-Mars alignments) SpaceX intends to send cargo to Mars to be used to establish not just a colony, but as Musk puts it, ‘a city’ on Mars.

This week: watch the moon as it waxes past Venus tonight at 7:30, Saturn on Wednesday, and Mars on Saturday.