Hubble telescope spots a 'Space Triangle' galaxy crash with 'tsunami of starbirth'

A head-on collision between galaxies has created a vast, cosmic triangle in deep space glittering with star formation in a new image captured by the Hubble Space Telescope.

The new photo, which NASA released Tuesday (Feb. 22), shows a pair of colliding galaxies known as called Arp 143 arranged in a what scientists described as a "space triangle" that is spawning a "tsunami of starbirth" by sharing gas and dust, according to a Hubble team statement.

"The two galaxies in this system collided head-on, fueling the triangular-shaped burst of star formation," Hubble officials wrote in the image description. "The pair contains the distorted, star-forming spiral galaxy NGC 2445 at right, along with its less flashy companion, NGC 2444 at left."

This wave of starbirth produced by the collision, officials added, appears to be rare due to the triangle shape of star formation visible in the image.

"Part of the reason for that shape is that these galaxies are still so close to each other, and NGC 2444 is still holding on to the other galaxy gravitationally," participating astronomer Julianne Dalcanton, of the Flatiron Institute's Center for Computational Astrophysics in New York and the University of Washington in Seattle, said in the Hubble statement.

Related: The best Hubble Space Telescope images of all time!

A Hubble Space Telescope image of colliding images, collectively known as Arp 143. (Image credit: IMAGE: NASA, ESA, STScI, Julianne Dalcanton Center for Computational Astrophysics, Flatiron Inst. / UWashington) IMAGE PROCESSING: Joseph DePasquale (STScI))

Dalcanton added, "NGC 2444 may also have an invisible, hot halo of gas that could help to pull NGC 2445's gas away from its nucleus. So, they're not completely free of each other yet and their unusual interaction is distorting the ring into this triangle."

Adding complexity to the collision is NGC 2444's propensity to pull away strands of gas from the other galaxy, creating "streamers" of young, blue stars bridging the two galaxies. The streamer stars were created between 50 million and 100 million years ago, but will be stuck in space as the galaxies continue to pull apart from each other.

Another set of young stars, only 1 million to 2 million years old, is also forming in the heart of NGC 2445. Meanwhile, NGC 2444 is only filled with older stars; it lost its gas before the collision occurred, astronomers said.

The collision provides "a fantastic sandbox to understand star formation and interacting galaxies," Elena Sabbi, a scientist at the Space Telescope Science Institute in Baltimore, added in the statement.

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Elizabeth Howell
Staff Writer, Spaceflight

Elizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. She was contributing writer for for 10 years before joining full-time. Elizabeth's reporting includes multiple exclusives with the White House and Office of the Vice-President of the United States, an exclusive conversation with aspiring space tourist (and NSYNC bassist) Lance Bass, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, flying parabolic, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and a Bachelor of History from Canada's Athabasca University. Elizabeth is also a post-secondary instructor in communications and science at several institutions since 2015; her experience includes developing and teaching an astronomy course at Canada's Algonquin College (with Indigenous content as well) to more than 1,000 students since 2020. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: