Credit: ESA/Hubble & NASA

A tiny sliver of sky holds thousands of galaxies in this image from the NASA/ESA Hubble Space Telescope.

Explore the tiny slice of the Universe called the Extended Groth Strip. How many galaxies can you count?

The area of the image covers a tiny piece of the sky; about the size of a finger held out at arms’ length. This part of the sky contains about 50,000 galaxies. Some galaxies, such as the one in the center show graceful spiral arms. Some edge-on galaxies are seen along with fuzzy elliptical galaxies. Other galaxies in this image have odd shapes.

The Strip is named after Princeton astronomer Edward Groth. It is a picture of a rectangular area of the sky in the constellation Ursa Major, the Big Bear, or Big Dipper. The farthest galaxies in the image are eight billion years old; twice as old as our solar system. Looking deep into the Universe allows astronomers a chance to see how galaxies evolve over time.