A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Trappist-1, a red dwarf star located 40 light-years from Earth, has seven Earth-sized planets that all transit the star from ...

then the third planet's orbital period will be 4.5 days. The Trappist-1 system, which hosts seven planets and is located ...

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TRAPPIST-1e is among three worlds in the habitable zone of this star, and it's right in the middle of the system with three closer planets and three farther away. If this modeling is correct ...

This 2018 artist's concept shows what the TRAPPIST-1 planetary system may look like, based on available data about the planets' diameters, masses and distances from the host star (far left).

The seven planets will not be perfectly aligned, but will appear in an arc across the sky due to their orbital plane in the Solar System.

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

the innermost planet in the TRAPPIST-1 system, might have a carbon dioxide-rich atmosphere. This discovery comes from new data showing a reflective haze in the planet's upper atmosphere.