A 2015 image from the Hubble Space Telescope reveals a faint moon orbiting the dwarf planet Makemake.
NASA, ESA, A. Parker and M. Buie/SWRI
THINKING OUTSIDE THE GOLDILOCKS ZONE The hunt for extraterrestrial life has long focused on planets at a just-right distance from alien stars, where liquid water can exist on a planet’s surface.
Nicolle Rager Fuller
PUTTING EYES ON EXOPLANETS A suite of current and future telescopes (including, from left, Spitzer, TESS, Hubble, James Webb and WFIRST-AFTA) could identify remote habitable worlds and peer into the newfound atmospheres for hints of alien biology.