Most of the long-period comets in the Solar System come from the outer Oort Cloud. The inner region is much more stable. It's closer to the Sun, which means it's more strongly bound by the Sun's ...

The inner Oort cloud, between 1,000 and 10,000 AU from the sun, displays a spiral formation with arms that extend 15,000 AU.

Kathleen deLaski unpacks her new book, which envisions higher education as a stepladder to skills that learners collect over ...

Located at approximately 4.3 km above sea level, MACE has observed this energetic burst, which is located 8 billion ...

In a groundbreaking achievement, NASA successfully sent a laser message from the Psyche spacecraft to Earth, spanning 16 ...