Dark Matter Is the Real Guardian of the Galaxies (Video) – Space.com


Step aside, Star-Lord – there’s another superhero in the universe, and it’s “guarding” far more galaxies than you can even fathom. 


In honor of the release of “Guardians of the Galaxy Vol. 2” in movie theaters today (May 5), scientists with the Hubble Space Telescope have released gorgeous new images of all the galaxies in our universe. The abundance of galaxies in Hubble’s view illustrates that, in the grand scheme of things, the fictional Marvel galaxy is pretty insignificant.


Not only does the real universe have far more galaxies (an estimated 2 trillion of them) but it also has a much bigger, darker and mysterious guardian of those galaxies: Dark matter, according to Space Telescope Science Institute astronomer Dan Coe. Space.com spoke with Coe about all those galaxies in Hubble’s latest images, and Coe explained how dark matter is really holding the universe together. [Gallery: Dark Matter Throughout the Universe]

Hubble Space Telescope image of the galaxy cluster Abell 370.
Credit: NASA, ESA, and J. Lotz and the HFF Team (STScI)


“So dark matter is this mysterious stuff that makes up most of the stuff in the universe. It’s all around us, but we don’t know what it is yet,” Coe said. “We can start to map it out and see it with gravitational lensing.” (Gravitational lensing is the warping of light around objects in space that have a strong gravitational pull.) 

These images from the Hubble Space Telescope's Frontier Fields program features massive galaxy clusters that act as gravitational lenses in space, magnifying and stretching images of distant objects in the background that would otherwise be too small and faint for Hubble to see.
Credit: NASA, ESA, STScI, and the HFF team


“If it wasn’t for this dark matter – this extra mass that holds [galaxies] together – they would all fly apart. And so you could call dark matter really the guardian of the galaxies,” Coe said.


Of course, dark matter won’t be able to battle any supervillains with diabolical plans to take over the galaxies Hubble has spotted, but, thankfully, scientists have found no evidence that Thanos, Ronan or any other evil characters could possibly exist in our universe. 


Email Hanneke Weitering at hweitering@space.com or follow her @hannekescience. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.

Dark Matter Is the Real Guardian of the Galaxies (Video) – Space.com

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