Close-ups of a curious surface texture on Comet 67P nicknamed "goosebumps," all of them at a scale of around 3 meters and spanning areas more than 100 meters. ESA/Rosetta/MPS hide caption

itoggle caption ESA/Rosetta/MPS

Australia's giant Parkes radio telescope detected a "fast radio burst," or FRB, last May. Researchers call FRBs, whose origins haven't been explained, "tantalizing mysteries of the radio sky." CSIRO/EPA/Landov hide caption

itoggle caption CSIRO/EPA/Landov

Beemer, shown at the Mars Society's Mars Desert Research Station in Utah in 2011, is a candidate for both Mars One and the Mars Arctic 365 program. Max Fagin hide caption

itoggle caption Max Fagin