I/ATLAS might be over 7 billion years old, a new study reports, which would make it the oldest comet known. But experts caution we need more data.

The universe is far bigger and more interconnected than we can truly comprehend. Its scale is mind-bending. Driving around ...

NASA’s Voyager 1 and Voyager 2 spacecraft delivered groundbreaking data that expanded our understanding of the solar system’s outermost edge,a region scientists call the "cosmic coastline." This is ...