The NASA/ESA Hubble Space Telescope has unveiled a stunning image of the Abell 209 galaxy cluster, located 2.8 billion ...

We've known the universe is expanding for a long time. The first solid paper demonstrating cosmic expansion was published by Edwin Hubble in 1929, based on observations made by Vesto Slipher ...

Explore HubbleHubble HomeOverviewAbout HubbleThe History of HubbleHubble TimelineWhy Have a Telescope in Space?Hubble by the ...

An image taken by the Hubble Space Telescope shows a distant galaxy that has been warped and distorted by a phenomenon called gravitational lensing.

The uncertainties in these measurements are about 1–2%, so there is a clear tension between the two techniques. Astronomers want to know why, and to find out they are developing new ways to measure ...

Gravitational lensing was discovered a century ago, and today, astronomers often use these lenses to see features otherwise too distant and faint to detect with even the largest telescopes.

Inconsistent constant The Hubble constant is a measure of the Universe's expansion, as you can tell from its units, which are kilometers per second per Megaparsec.

The gravitationally lensed galaxy SGAS J143845+145407 shines at the center of the Hubble Space Telescope image. “Gravitational lensing can result in multiple images of the original galaxy, as ...

A citizen scientist found an Einstein ring, a natural phenomenon caused by gravitational lensing, in a Hubble Space Telescope image.

The Hubble Space Telescope has captured the mirror image of a distant galaxy. NASA released the photo which appears to show two galaxies, but is actually one duplicated by gravitational lensing.

Hubble Telescope Spots Bizarre "Magnifying Glass" Optical Illusion Predicted by Einstein Gravitational lensing appears in new image from the Hubble Space Telescope.

Gravitational lensing was something that Einstein had many theories about, and he’s been proven right thanks to modern technology.