Each of the planets, labeled b, c, d, and e, has a mass between 20% and 30% of Earth's, making them among the smallest yet detected using the radial velocity method.

Scientists have discovered a colossal water reservoir in space, containing as much water as 100 trillion times all the oceans ...

This suggests that something is gravitationally tugging on the star, similar to how the moon pulls on our planet and causes ...