Two new, but separate, studies provide fresh insight into planets orbiting the nearby red dwarf star TRAPPIST-1.

One of the studies, published in the journal Nature Astronomy, suggests the atmospheres of at least three of the seven TRAPPIST-1 exoplanets found so far do not seem to be as hydrogen-rich as our solar system’s gas giant planets such as Neptune.

Researchers involved with this study say that this finding means the planet’s atmospheres may contain heavier gases like those found in Earth’s atmosphere.

The second study, published in the journal Astronomy & Astrophysics, contains detailed calculations of the masses, as well as the density and make-up of all the TRAPPIST-1 planets.

The researchers found that the planets are mostly rocky and contain up to five percent water.

The TRAPPIST-1 system is only 40 light years from Earth.