Kepler was a deep space telescope orbiting the Sun at a distance of 3 million kilometers from Earth. We were not sure if there were any planets outside the Solar System. Since then, and running out of fuel in 2018, its photometer has shown us about 2,600 aliens. There are a number of hellish planets where lava flows.
But some are even ahead of Earth in the rating for survival. Of these, Kepler’s most similar to Earth is 1649 c. In terms of size and distance from the parent star, or the habitable zone, or the ability to retain water, the planet is by all means the opposite of Earth.
The James Webb Telescope, sent a few days ago, seems to be able to tell if there’s life on this rocky planet 300 light years away. Waiting for the moment to open his eyes.