Summary:
- Astronomers have discovered several "super-Earth" planets that orbit distant stars, some much farther from their stars than Earth is from the Sun.
- These super-Earths are larger than Earth but smaller than Neptune, and they can form in the outer regions of planetary systems where it was previously thought impossible.
- The discovery challenges the traditional view of how planetary systems form and evolve, and suggests that super-Earths may be more common in the universe than previously believed.