Dr. Sten Odenwald is an astronomer and educator with the NASA Heliophysics Education Consortium, who also runs an online resource called The Astronomy Cafe. He received his PhD in astrophysics from ...

An invisible monster lurks beyond the stars of the constellation Sagittarius near the border with Scorpius: a supermassive black hole, designated as Sagittarius A* (pronounced “Sagittarius A-star”), ...

A moon is generally understood to be an object that orbits a planet (although what counts as a planet is itself a contentious matter). Beyond that, a more precise, official defini ...

Astronomers have discovered a brand-new type of planet outside our solar system that, even in its infancy, is already bigger than Jupiter. What's more, the find represents the first clear detection of ...

WASHINGTON, Oct 9 (Reuters) - Just as Earth orbits the sun, most planets discovered beyond our solar system orbit a host star. But some are out there all by themselves, called rogue planets. While ...

As the interstellar object 3I/ATLAS speeds through the solar system, Harvard astronomer Avi Loeb is keeping the possibility ...

The Hayabusa2 mission is facing a new challenge after observations showed the asteroid it is going to rendezvous with and touchdown on in 2031 is much smaller than previously thought; it's also ...

Human perception of time is an illusion constructed by the brain, based on memory and anticipation, limited to an experience of the "now" lasting approximately one second. This subjective experience ...