The first observations of the TRAPPIST-1 system reported in 2016 revealed three planets orbiting a small, red-dwarf star, though the exact location of the outermost one, was not well-determined (yellow band, top image).
Three of the TRAPPIST-1 planets dwell in their star's so-called 'habitable zone,' shown in green. This is the band around the star where temperatures are just right, not too hot, not too cold, for liquid water to pool on the surface of an Earth-like world
The TRAPPIST-1 star, an ultra-cool dwarf, has seven Earth-size planets orbiting it. This artist's concept appeared on the cover of the journal Nature in Feb. 23, 2017 announcing new results about the system.
NGC 1448, a galaxy with an active galactic nucleus hidden by gas and dust, is seen in this image combining data from the Carnegie-Irvine Galaxy Survey in the optical range and NASA's NuSTAR in the X-ray range.
This artist's concept shows a pulsar, which is like a lighthouse, as its light appears in regular pulses as it rotates. Pulsars are dense remnants of exploded stars, and are part of a class of objects called neutron stars.
This artist's concept depicts 'heartbeat stars,' which have been detected by NASA's Kepler Space Telescope. Two heartbeat stars are seen swerving close to one another in their closest approach along their highly elongated orbits around one another.
This illustration based on computer modeling and data from NASA's Kepler Space Telescope, represents how hot Jupiters of different temperatures and different cloud compositions might appear while flying over the dayside of these planets on a spaceship.
This image of galaxy cluster Abell 2744, also called Pandora's Cluster, was taken by NASA's Spitzer Space Telescope. The gravity of this galaxy cluster is strong enough that it acts as a lens to magnify images of more distant background galaxies.
Infrared Echoes of a Black Hole Eating a Star (Illustration)
This illustration shows a glowing stream of material from a star as it is being devoured by a supermassive black hole in a tidal disruption flare. Astronomers gained new insights into tidal disruption flares thanks to data from NASA's WISE.