Artistic representation free to use with attribution Arndt Stelter - CC BY 4.0
First results from the James Webb telescope:
The innermost planets Trappist-1 b and c have little or no atmosphere.
Colored brighter than Mercury but darker than Mars.
Hotter than the Moon but colder than Mercury.
These two of the seven planets in this system, whose central star is an ultracool red dwarf, are already different from what we had hoped.
It remains to be seen what the other five planets will reveal.
All seven planets are about the size of our Earth.
But the system itself is tiny, and the star is also very small.
The complete system would fit several times within the Mercury orbit.
Also this system is very old, clearly older than our solar system.
Red dwarfs tend to rage and it seems that the planets have had to endure a lot in all the billions of years and have lost their atmosphere over time.
Also, it seems, there is no volcanic activity that would ultimately re-form an atmosphere again and again.
A revealing but unfortunately also sobering discovery so far. A. Stelter
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