NASA's Hubble Captures Magnificent Image of Intergalactic Bridge
This ethereal flyover between two galaxies could easily be the backdrop of a Star Trek episode.
Monisha RavisettiFormer Science Writer
Monisha Ravisetti was a science writer at CNET. She covered climate change, space rockets, mathematical puzzles, dinosaur bones, black holes, supernovas, and sometimes, the drama of philosophical thought experiments.
Previously, she was a science reporter with a startup publication called The Academic Times, and before that, was an immunology researcher at Weill Cornell Medical Center in New York. She graduated from New York University in 2018 with a B.A. in philosophy, physics and chemistry.
When she's not at her desk, she's trying (and failing) to raise her online chess rating. Her favorite movies are Dunkirk and Marcel the Shell with Shoes On.
Between black holes devouring smallish stars and vacant space embracing busy nebulas, our universe's caverns of darkness are often relieved by glimmers of light -- a poetic juxtaposition clearly apparent in one of NASA's latest Hubble Space Telescope images.
Last week, the agency released an ethereal view of galactic triplet Arp 248, also known as Wild's Triplet for both the discoverer and the utterly extravagant nature of the spectacle itself. Behold.
In this impeccable photo, two of three galaxies can be seen in the foreground of space's void, bleeding into each other like they're made of over-hydrated watercolor paint and forming what I can only describe as an intergalactic bridge. A third, unconnected realm stands in the far ground, enshrouded by deceptively tiny sparkles that represent a cosmic lifetime of even more galaxies scattered across the universe.
What's especially mind-numbing about this image is that from Hubble's vantage point -- in Earth's orbit, some 200 million light-years away -- the three galaxies are compact enough to fit on our computer screens.
In reality, these worlds are many (many) light-years wide, holding an incomprehensible amount of doppelgangers to our sun, exoplanets like our solar system's eight, and moons akin to our glowing lunar companion.
They are miniature universes in themselves, existing on a scale simply unfathomable to the human mind yet available for us to download as desktop wallpapers.
It is, in fact, because of those hefty contents that the two massive spirals at the centerpiece of this image are linked by a luminous bridge in the first place. Both harness immensely strong gravitational forces and are therefore pulling on each other like they're playing a gentle tug of war, accidentally creating what's known as a tidal tail, or an elongated stream of stars and iridescent interstellar dust.
Tidal tails are usually the product of galaxies treading very close to one another while on a path toward merging into one huge galaxy. We've seen the breathtaking phenomena several times already -- tidal tails are responsible for some adorable galaxy systems names, too.
"The Mice," or NGC 4676, boasts merging galaxies about 300 million light-years away from Earth, and "The Tadpole," or UGC 10214, contains a large galaxy in the process of shredding a smaller galaxy, another event type that resulted in an awesome tidal tail.
When galaxies merge, it's quite likely only a few actual collisions happen. Think about two large crowds entering a stadium, merging into one massive crowd. Most of the time, individuals wouldn't literally bump into each other. They just settle near each other. Now imagine the same situation, except with about a light-year of space between every person.
"Each collection contains a menagerie of spectacularly peculiar galaxies, including interacting galaxies such as Arp 248, as well as one- or three-armed spiral galaxies, galaxies with shell-like structures, and a variety of other space oddities," NASA said of the atlas.
It's a vast work filled with yet more examples of our wonderfully contrasted universe, an expanse built from the mind of a poet and condensed with the skill of a machine.