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Huge extragalactic structure found 'hiding' behind Milky Way

The structure could include more than 50 galaxies (aRxiv)
The structure could include more than 50 galaxies. (aRxiv)

Scientists have spotted what they describe as a “massive extragalactic structure” lurking behind our galaxy.

To make things even more mysterious, it’s concealed behind the “zone of avoidance” – a large opaque bulge in the Milky Way.

The structure appears to be a large galaxy cluster with up to 58 galaxies in the structure.

The pre-print study has been uploaded to ArXiv.

It’s described as ‘extragalactic’ simply because it’s outside our own Milky Way according to the researchers at the Universidad Nacional de San Juan, Universidade Federal do Rio Grande do Sul and Universidad Andres Bello.

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Space scientists have known for some time that there is one part of the night sky that is mostly obscured from view due to a bulge in the galaxy.

Known as the "zone of avoidance", it makes up approximately 10% of the dark sky and has had researchers wondering what might be behind it.

Because it offers researchers so little to work with, the zone has not been very well studied; thus, little is known about what it might be hiding.

The researchers used a variety of tools to gain a better understanding of what might be hidden from view.

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The researchers with this new effort started by gathering all of the data that has been collected so far and added more using information recently obtained from the VVV Survey.

The VVV Survey is a project sponsored by an intergovernmental research organisation called the European Organization for Astronomical Research in the Southern Hemisphere. It involves multiple state-of-the-art research facilities located at multiple sites.

The survey has been involved in studying the stars using infrared emissions rather than visible light.

Such emissions are able to pass through the gas, dust and light from the stars in the bulge and on to instruments set up here on Earth.

In studying the infrared imagery, the researchers found that they were able to identify several galaxies that exist far beyond the Milky Way.

Because of their numbers, the researchers believe that together, they make up what they describe as a massive extragalactic structure.

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