Exomoons: On the hunt for distant worlds

The search for exoplanets, which orbit distant stars, has opened up a whole galaxy of worlds beyond our own. Over 3,700 have been discovered to date, but they may have companions.

Since the first confirmed discovery of planets beyond our own Solar System over 20 years ago, we have known that our stellar neighbourhood is not unique in the Universe.

But now the frontier of exploration is shifting again; because where there are planets, there should be moons.

And those moons could be surprisingly Earth-like.

https://www.bbc.com/news/science-environment-44605761