Recent Magma Heating Might Explain Water on Mars
Magma flows hundreds of thousands of years ago might account for the water on Mars, but scientists do not know if Mars could produce magma that recently.
New Horizons Images Show Fewer Small Kuiper Belt Objects than Expected
High resolution images from New Horizons of the surfaces of Pluto and Charon show ancient craters, but fewer than astronomers expected.
Simulating an Extreme TNO on the Road to Planet Nine
The most extreme Solar System object was recently discovered, offering some clues about the mysterious Planet Nine.