On the night of October 5-6, 1923, Carnegie astronomer Edwin P. Hubble took a plate of the Andromeda Galaxy (Messier 31) with the Hooker 100-inch telescope of the Mount Wilson Observatory. This plate, ...

Edwin Hubble first identified the Universe’s expansion in 1929. Since then, the rate of expansion – called the Hubble constant – has been the focus of countless measurements. Each generation of ...

This discrepancy between model and data became known as the Hubble tension. Now, results published in the Astrophysical Journal Letters provide even stronger support to the faster rate of expansion.

Find the best telescopes to unlock the wonders of the night sky and view lunar occultations, celestial conjunctions and planetary parades in January. The best telescope unlocks the wonders of the ...

Why it's so special: This iconic montage features images of Jupiter, Saturn, Uranus and Neptune captured between 2014 and 2024 as part of the Hubble Space Telescope's Outer Planet Atmospheres ...

These discoveries, beginning with George Ellery Hale's visionary work and continuing through researchers like Edwin Hubble, have shaped our evolving comprehension of the universe. In 1904 George ...