Summary:
- This article discusses the possibility of finding signs of alien life by looking for "suspiciously similar" planets orbiting different stars.
- Astronomers have discovered that some exoplanets (planets orbiting other stars) have very similar properties, which could indicate they were formed by the same process.
- If we find more examples of these "twin" planets, it could be a sign that the conditions for life are common in the universe, and that life may have evolved on multiple worlds.