There's no shortage of round celestial objects in our universe. Planets, moons and stars all exhibit lovely spherical shapes.

As SpaceX readies Starship’s next test, questions over refueling and mass limits threaten its lunar and Martian goals.

Scientists have long puzzled over a discrepancy in how fast the universe is expanding, but new, sharper data from the James Webb Space Telescope may finally be solving the mystery. By refining ...

Some hail it as one of the best episodes of Star Trek: The Next Generation.Others dismiss it as a silly take on a complex sci-fi concept. When it was released 31 years ago, the Season 7 episode ...