In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

A bouquet of thousands of stars in bloom has arrived. This composite image contains the deepest X-ray image ever made of the ...

A neutrino detector submerged in the Mediterranean Sea has sniffed out the most energetic ghost particle yet, scientists ...

NASA’s Hubble Space Telescope Discovers a Cosmic Bullseye, Found to Be a Galaxy With Star-Filled Rings Astronomers observed a unique image of a galactic collision between galaxies which created a ...

Blue stragglers, formed from the merger of two old red stars, shine with greater mass and a bluer hue, a theory confirmed by ...

Quipu, Hercules, Serpens–Corona Borealis and Sculptor–Pegasus are all larger than the fifth and final superstructure ...

The cosmic superstructure Quipu is more than 13,000 times the length of the Milky Way, and its mass is 200 quadrillion times ...

The Hubble Space Telescope’s latest stunning images have allowed scientists to solve the mystery of the Bullseye Galaxy’s ...

Hubble’s high-resolution imagery allowed researchers to hone in on more of the Bullseye galaxy’s rings — and helped confirm ...

A small blue dwarf galaxy passed through the massive Bullseye galaxy. This impact created nine rings of new stars.

A blue dwarf galaxy pitched through the bullseye's galactic neighborhood 50 million years ago, leaving behind nine glittering rings.