What does the discovery of a binary pulsar in 1974, the discovery of the first exoplanets, and the most powerful message humans have ever sent out into space all have in common? They all happened at the Arecibo Observatory in Puerto Rico. With a spherical reflector dish that was 305 ...

A rogue planet is a world that has been ejected from the planetary system in which it originally formed. Because rogue planets do not orbit a parent star, they are cast adrift into interstellar space. On their meanderings, rogue planets are pulled toward whatever large, gravitationally ...