This recently-reported exoplanet TOI-715 b purportedly located in its local habitable zone, and sized roughly 1.5 times Earth and triple earth mass, left me to wonder…
How much the gravity there might differ, and how much (more?) energy is involved in launching spacecraft from there.
Terrestrial delta-v is most of ten kilometers per second. That’s how fast you need to be going to climb out of the gravity well.
If that exoplanet well is deep enough and it seems plenty deep, getting off that rock gets much harder.
At some point the gravity well effectively becomes a one-way trip down.
(Not that Earth and its planetary politics doesn’t have its own version of the Schwarzschild radius.)
That 0.083AU distance and that ~463.2 hour long year are both entirely disconcerting, but three earth masses just doesn’t seem all that habitable. For us.
