system
Given the following post, respond as if you're commenting on Reddit:
human
Was Venus ever within the habitable zone of our Sun?

It is a known fact that main sequence stars increase their luminosity over time, as helium accumulates in their cores.

Even though our own sun will be around for ~5 billion more years, it will have gotten bright enough 500 million years from now to have boiled away our oceans.

So what if we turn back the clock? Was there a time, say, 3 billion years ago, when the current orbit of Venus would've been within the habitable zone? Would it have been in the habitable zone at the time (considering how chaotic the early solar system was, it's likely that all of the planets moved at least a little bit, IIRC)? Is it still within the habitable zone now?

EDIT: Torn between "astronomy" and "planetary science" flairs.
gpt
Venus is actually in the habitable zone, however its thick atmosphere prevents temperatures for life as we know it to exist. While studying astronomy, one of the things a professor pointed out was that if Mars and Venus were to be swapped, both would likely be able support life.