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WASHINGTON (Reuters) – Astronomers have found some matter that had been missing in deep space and say it is strung along web-like filaments that form the backbone of the universe.

The ethereal strands of hydrogen and oxygen atoms could account for up to half the matter that scientists knew must be there but simply could not see, the researchers reported on Tuesday.

Scientists have long known there is far more matter in the universe than can be accounted for by visible galaxies and stars. Not only is there invisible baryonic matter — the protons and neutrons that make up atoms — but there also is an even larger amount of invisible “dark” matter.

“We think we are seeing the strands of a web-like structure that forms the backbone of the universe,” said Mike Shull of the University of Colorado, who helped lead the study published in The Astrophysical Journal.

The matter is spread as superheated oxygen and hydrogen in what looked like vast empty spaces between galaxies.

“It is kind of like a spider web. The gravity of the spider web is what produced what we see,” Shull said in a telephone interview. “It’s very thin. Some of it is very hot gas, almost a million degrees.”

This is where the dark matter comes in. The dark matter is heating up the gas, Shull said.

“Dark matter has gravity. It pulls the gas in,” Shull said. “This causes what I call sonic booms — shock waves. This shock heats it to a million degrees. That makes it even harder to see.”

Shull and colleagues said these webs of hydrogen and oxygen are too hot to be seen in visible light and too cool to be seen in X-rays.

Full Article: Yahoo!

It is quite remarkable how they have discovered this matter that has remained to elude many scientists for a while now. Even though the dark matter hasn’t been found itself, its affects have been found. However, since they have only found a partial amount of it, the search for the rest continues.