Voyager 1, shown in this illustration, has operated for decades thanks to a radioisotope power system. NASA via AP Benjamin Roulston, Clarkson University Powering spacecraft with solar energy may not ...

The European Space Agency’s astronaut cohort includes a parastronaut, as part of a feasibility project. AP Photo/Francois Mori Jesse Rhoades, University of North Dakota and Rebecca Rhoades, University ...