Wednesday was a double whammy for big astronomy news with 2 groups both announcing the discovery of water in the atmosphere of a small exoplanet named K2 18b while solar system astronomers announced that a recently discovered comet came from interstellar space.
The comet C/2019 Q4 Borisov is a pretty big deal for me because the previous interstellar object was small, bizarre and only visible for a short time. This time it's a much large object that's an active comet and will be visible to telescopes for a lot longer.
The discovery of water in the atmosphere of K2 18b shouldn't be taken as some sign that it's habitable, because the planet is so large it likely has a thick crushing atmosphere at its surface, but it's a good sign that there may be more objects out there holding on to atmospheres while orbiting in the nonuninhabitable zone of M class stars.