A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Comets SWAN and Lemmon will both swing by Earth and appear bright in the sky near the end of October. Here’s how to see them.

Scientists out of the Pan-STARRs observatory in Hawaii discovered the new quasi-moon on Aug. 29, according to CNN and ABC News. It is believed that PN7 has been a quasi-moon for an estimated 60 years.

Scientists may have made an "out of this world" discovery. New research suggests that a mysterious glow in our galaxy might be caused by dark matter, an invisible form of matter believed to be five ...

(CNN) — The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have ...