Dwarf Galaxy Churns out New Stars in Hubble Photo

Hubble Image of Star-Forming Dwarf Galaxy
This image from NASA's Hubble Space Telescope shows the faint irregular galaxy NGC 3738, which is in the midst of a violent episode of star formation, as evidenced by the red glow of hydrogen gas surrounding the galaxy. (Image credit: ESA/Hubble & NASA)

A stunning new image from NASA's Hubble Space Telescope shows countless stars being born in a nearby dwarf galaxy.

The Hubble photo depicts the faint irregular galaxy NGC 3738, which is located about 12 million light-years from Earth in the constellation Ursa Major (The Great Bear). NGC 3738 is undergoing a violent episode of star formation, converting huge clouds of hydrogen gas — which glow red in the image — into new stars.

NGC 3738 is a type of galaxy known as a blue compact dwarf, researchers said. Unlike elliptical galaxies or spirals, blue compact dwarfs tend to be chaotic in appearance, lacking distinctive features such as central bulges or spiral arms. They're thought to resemble some of the universe's earliest galaxies and could provide clues about how stars looked shortly after the Big Bang, researchers said.

Blue compact dwarfs, which get their color from large clusters of massive, hot-burning stars, also tend to be much smaller than many other types of galaxies. Indeed, NGC 3738 is 10,000 light-years across — just one-tenth the size of our own spiral Milky Way.

The new photo was generated by combining visual and infrared images taken with the Wide Field Channel of the Advanced Camera for Surveys aboard the Hubble Space Telescope. The Wide Field Channel's field of view is approximately 3.4 by 3.4 arcminutes wide, researchers said.

Hubble is a joint operation of NASA and the European Space Agency. The telescope has made more than 1 million science observations since its April 1990 launch, and it's still going strong.

Follow SPACE.com on Twitter @Spacedotcom. We're also on Facebook & Google+

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: community@space.com.

Space.com Staff
News and editorial team

Space.com is the premier source of space exploration, innovation and astronomy news, chronicling (and celebrating) humanity's ongoing expansion across the final frontier. Originally founded in 1999, Space.com is, and always has been, the passion of writers and editors who are space fans and also trained journalists. Our current news team consists of Editor-in-Chief Tariq Malik; Editor Hanneke Weitering, Senior Space Writer Mike Wall; Senior Writer Meghan Bartels; Senior Writer Chelsea Gohd, Senior Writer Tereza Pultarova and Staff Writer Alexander Cox, focusing on e-commerce. Senior Producer Steve Spaleta oversees our space videos, with Diana Whitcroft as our Social Media Editor.