In 1974, the project’s Science Working Group recommended that the telescope be required to resolve details at least one-tenth ...

Only a small fraction of the observable universe is comprised of visible matter. Current data suggests all galaxies are ...

So, to create a must-read story list for you, we asked our staff to select their favorite pieces of 2025. Alas, while you're ...

Fourth anniversaries aren’t often causes for celebration. But in the case of the James Webb Space Telescope (JWST), which ...

Our understanding of the true nature of the cosmos relies on measurements of its expansion, but cosmologists have been arguing back and forth about it for more than 100 years ...

Dark energy is the mysterious force thought to be accelerating the universe. . But a new study hints that scientists may have ...

The shape of the universe is not something we often think about. My colleagues and I have published a new study that suggests ...

On Dec. 15, 1612, the Andromeda galaxy was seen through a telescope for the first time by a German astronomer named Simon Marius. [‘On This Day in Space’ Video Series on Space.com] The Andromeda ...

The tension started to emerge from different datasets in the 2000s, mainly from the Hubble Space Telescope, and also recent ...