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In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small ...

Around 13.7 billion years ago, something collapsed. It fell outward into the nothingness that stretched in every direction, ...

Using the Hubble Space Telescope (HST), astronomers have observed a supermassive galactic open cluster designated Westerlund ...

Astronomers using the Hubble Space Telescope (HST) have studied one of the largest young star clusters in our galaxy, ...

The Phoenix Cluster's central galaxy is about 5.8 billion light-years away and should be mostly done with star formation.

The dazzling spiral galaxy in this Hubble Space Telescope image is UGC 5460, located about 60 million light-years away in the ...

Like its mythological namesake, the Phoenix Cluster burns with blisteringly hot gas, which cools to birth stars. The James ...

NASA has captured breathtaking images of seven rare and stunning interacting galaxies, showcasing cosmic collisions, ...

Hubble captured Westerlund 1, a massive young star cluster with 50,000+ stars. This study reveals stellar motion, structure, ...

Compared to their more isolated counterparts, the galaxies in galaxy clusters are often distorted by the gravitational pull ...

The center of our Milky Way galaxy is hidden from the prying eyes of optical telescopes by clouds of obscuring dust and gas.