In the Dec. 9 SN: Lessons from the Pliocene, searching for new ways to fight MS, a supernova on repeat, the great gene drive debate, spider sleep secrets, an ailing boy gets new skin, kleptopredation and more.
NORTHERN LAKES Radar images of Titan’s poles show lakes that may form like Earth’s sinkholes. A new topographic map suggests these hydrocarbon lakes may be connected through Titan’s equivalent of groundwater.
JPL-Caltech/NASA, ASI, USGS
ALIEN ASTEROID This artist’s representation of interstellar asteroid ‘Oumuamua shows its unusual shape: 400 meters long and just about 40 meters wide. No asteroids in the solar system are shaped like that.
M. Kornmesser/European Southern Observatory
FOND FAREWELL The Cassini spacecraft took this last look at the Saturn system two days before plunging into the giant planet’s atmosphere.