[onlyrealcuzzo]

Wasn't Venus at one time more Earth like than Mars? Why is Mars the only chance?

[satyenr]

Because Venus’ atmosphere is full of Sulphuric Acid and various greenhouse gases which wouldn’t allow life as we know it to exist.

[drran]

Our atmosphere is full of Oxygen, which is very poisonous gas, which killed 99% of live organisms on Earth. See https://en.wikipedia.org/wiki/Great_Oxidation_Event

Life adapts.

[dredmorbius]

There's some speculation that Venus may have been far more earthlike for some, possibly much, of its history.

Similarly, Earth wasn't particularly earthlike, in contemporary terms, for much of its history -- sometimes far hotter, frequently far colder.