This predictable change helps astronomers calculate their distance from Earth. Hubble used a Cepheid star's distance to prove Andromeda was a separate galaxy.

This serene spiral galaxy hides a cataclysmic past. The galaxy IC 758, shown in this NASA/ESA Hubble Space Telescope image, is situated 60 million light-years away in the constellation Ursa Major.

Federal Reserve Chairman Jerome Powell and President Donald Trump have been at odds with each other since the start of his second term. But Trump's attempts to drive him out of his role may end up ...

Feb. 4, 2025 — NASA's Hubble Space Telescope has captured a cosmic bullseye! The gargantuan galaxy LEDA 1313424 is rippling with nine star-filled rings after an 'arrow' -- a far smaller blue ...