The SETI Institute leads the hunt for extraterrestrials, which has entered a new phase with myriad planets to focus on.
Data from the second probe to reach interstellar space helps scientists form a more complete picture of the boundary between the sun and the stars.
Researchers find plausible, alien-free explanation for observations of star KIC 8462852.
New research suggests the interstellar interlopers may indicate the presence of a vast number of as yet undetected giant exoplanets.
Planet K2-18b is about twice as wide as Earth and located about 110 light-years away.