Artist's impression of a hypothetical exomoon going around an imagined planet. Exomoons have not been discovered yet, but we know of thousands of exoplanet candidates. | NASA

TRAPPIST-1 Planets Have No Large Moons, Raising Questions about Habitability

The conditions for habitable exoplanets in the TRAPPIST-1 system might depend on the presence of large moons — and Earth reveals clues to why. 

Published On 05/05/2017
12:34 PM EDT
Artist's impression of the TRAPPIST-1 system, located about 40 light-years from Earth. | NASA/JPL-Caltech/R. Hurt, T. Pyle