A time traveler's survival guide. The vertical green bars are the only times in Earth's history with enough oxygen to breathe (hypoxia) and low enough to avoid oxygen toxicity (hyperoxia).

@j4k3 · edit-2 5 months ago

A time traveler's survival guide. The vertical green bars are the only times in Earth's history with enough oxygen to breathe (hypoxia) and low enough to avoid oxygen toxicity (hyperoxia).

Otter · 5 months ago

That also makes me wonder how we do our studies on other planets and if there is a category for “not habitable, but it could be”

@[email protected] · 5 months ago

Or similarly, “not habitable, but it could have been”. Subtle difference between the two.

Tlaloc_Temporal · 5 months ago

We can just barely sometimes tell the difference between a small neptune, a large earth, an ocean planets, a coteless ocean planet, and a hycean planet. Trying to guage not just habitability but also terraformability is a ways off yet.

We can start with size and surface temperature though. We’re not going to survive on a gas giant, and anything with a four digit temperature is right out.