Moon Losing Its Water
April 24, 2019
The moon loses more water than it receives from the solar wind or meteorites. How long has that been going on?
Pluto Is Young
July 15, 2015
The New Horizons science team is stunned by surface features on Pluto and its large moon Charon that cannot be billions of years old.
Saturn's Rings Impacted by Meteoroids
April 30, 2013
Cassini has observed clouds of dust from meteoroids hitting the rings. The data will "impact" theories of the rings' origin and age.