Photo by MIKE OLBINSKI

Photo by BRAD GOLDPAINT

Photo by JORDI DELPEIX BORRELL

Photo by TIANHONG LI

Photo by NASA/JSC

Photo by ESO 

Photo by NASA/JPL-CALTECH

Photo by NASA/ESA HUBBLE SPACE TELESCOPE

Photo by NASA/MARK VANDE HEI

Photo by ESA/NASA-A.GERST

Photo by NASA/JPL-CALTECH/UNIV. OF ARIZONA

Photo by NASA/JPL-CALTECH/SWRI/MSSS/KEVIN M. GILL

Photo by NASA

A collection of this year's most stunning photos. Learn more at nationalgeographic.co.uk