Advanced civilizations will overheat their planets within 1,000 years, researchers suggest

[PoindexterOglethorpe]

3. My Son The Astronomer is doing exoplanet research.

So far we haven't found any planets remotely conducive to Life As We Know It. (Life not as we know it, we can't speculate about)

Our technology is getting close, but still isn't quite where we can detect life-supporting planets.

Something else to keep in mind when speculating about the possibility of alien civilization is this: our sun is a g-type star. A bit less than 8% of the stars in our galaxy are like ours. Although that's still many millions of stars.