A snow- and ice-covered canyon on TRAPPIST-1d. Rocks, stones and debris, remains from ancient landslides, fill a part of the valley, now eroded by strong winds and heavy ice-storms.
The newly discovered TRAPPIST-1-System consists (so far) of three rocky planets, all a little larger than earth, orbiting an ultracool red dwarf star, about 40 lightyears away. The star’s diameter is not much bigger than Jupiter’s and the mass is only about 8% of the solar mass, at the limit to a Brown Dwarf.
TRAPPIST-1d is the outermost planet of the system until now.
It’s one of the tiniest known systems: All planets including the host star need only as much space as Jupiter and it’s first ten moons…
TRAPPIST-1d lies probably outside the habitable zone, with a mean irradiation of about 15% the irradiation the earth receives from the sun and an average temperature of about 200 K, so I presumed an Ice-planet with a martian-like climate, but a denser atmosphere. If TRAPPIST-1d is geological active, it exists possibly also liquid water due to internal heat.
Basic data refers to the paper of Gillon et al. 2016, some further extrapolations to explain the render are made by myself.
I tried to be as accurate as possible creating this render:
The emitted visible light of the host star is very reddish and very dim. A clear and sunny day at the surface it’s only as bright as a faint hallway light. So the brighter stars are also visible during the day. A cloudy day will be almost dark. The sky itself is bluish-black with a violet tinge. There is not enough short-wave radiation to scatter in the atmosphere and create a „blue” sky as we know it. The most radiation of the host star lies in the infrared part of the spectrum, not perceptible to human eyes. The two pale dots near the sun at the upper-right and the lower-left are the two other planets of the system, b and c. The apparent diameters of the planets and the sun are depicted as realistic as possible. TRAPPIST-1 fills a little bit more than a degree at the sky of Planet d, twice the apparent diameter of the sun seen from earth and the planets are visible as tiny globes with phases.
Rendered in Terragen 3.4, Postwork with Pixelmator.