Alien Worlds of TRAPPIST-1 --"We're Seeing for the 1st Time Earth-Sized Planets With Lots of Water or Ice"

"What we are seeing for the first time are Earth-sized planets that have a lot of water or ice on them," says Arizona State University astrophysicist, Steven Desch. TRAPPIST-1 is an ultra-cool red dwarf star that is slightly larger, but...