Further Work on TRAPPIST-1

[Doug Loss]

Further Work on TRAPPIST-1

A closely packed planetary system like the one we’ve found at TRAPPIST-1 offers intriguing SETI possibilities. Here a SETI search for directed radio transmissions aimed at the Earth gives way to an attempt to overhear ongoing activity within another stellar system. For it’s hard to conceive of any civilization developing technological skills that would turn away from the chance to make the comparatively short crossing from one of the TRAPPIST-1 worlds to another.

Our more spread out system is challenging for a species at our level of technological development, but a colony on Mars or an outpost on Titan would surely produce intense radio traffic as it went about daily operations and reported back to Earth. Could TRAPPIST-1 be home to similar activities? The SETI Institute has continued to investigate the prospect, starting with ‘eavesdropping’ observations at 2.84 and 8.2 GHz in early April.

(more at link)

[Joe Wooten]

Latest on Trappist -1 and other red dwarf system habitability.

https://www.universetoday.com/136451/even-though-red-dwarfs-long-lasting-habitable-zones-theyd-brutal-life/

Not good chances for life.

[Cripplecreek]

Latest on Trappist -1 and other red dwarf system habitability.

https://www.universetoday.com/136451/even-though-red-dwarfs-long-lasting-habitable-zones-theyd-brutal-life/

Not good chances for life.

Certainly not good chances for earth life but there are too many variables and unknowns to say with surety that there can be no life there.

I imagine living on a tidally locked star to be less than ideal. You would have to be in a place where the sun was always low on the horizon and there would be strong icy winds blowing from the dark side to the light side. Under a red sun plant life would appear black.

[Joe Wooten]

According to this, after a few million years there would be little atmosphere left on any Earth size planet in a red dwarf habitable zone.

[Cripplecreek]

According to this, after a few million years there would be little atmosphere left on any Earth size planet in a red dwarf habitable zone.

Again, purely theoretical. Venus has virtually no magnetosphere yet has an atmosphere some 92 times as dense as earth's.

[Joe Wooten]

Again, purely theoretical. Venus has virtually no magnetosphere yet has an atmosphere some 92 times as dense as earth's.

Venus is also not tidally locked into a tight orbit around a flaring red dwarf. It is just inside the habitable zone for out system and has enough gravity to keep its atmosphere. I can guarantee that it if it was in Mercury's orbit, it probably would not have much atmosphere left.

[Oceander]

Again, purely theoretical. Venus has virtually no magnetosphere yet has an atmosphere some 92 times as dense as earth's.

Venus also has no oceans, so measuring its atmosphere from the lowest point on the surface isn't comparable to measuring Earth's atmosphere at sea level.

[kevindavis007]

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