A study written by a Tel Aviv University professor suggests that a recent observation of early stars has shown the very first actual signs of dark matter.

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An Israeli study may have confirmed, for the first time in history, the existence of dark matter, an invisible material which scientists believe makes up about 25% of the universe.

According to the study, which was published recently on the scientific paper Nature, the discovery was made through the analysis of a faint radio wave signal from deep space, picked up by a telescope in Australia. Prof. Judd Bowman of Arizona State University, who led the discovery, said the signal came from very early objects and stars that formed after the Big Bang.

Prof. Rennan Barkana of the Tel Aviv University, the author of the Nature study, said the unusually cold temperatures of the hydrogen gas between those stars can be explained by its possible interaction with dark matter.

“Until now, the only testament to dark matter was its gravitational force, which explains a variety of phenomena in the universe,” said Barkana.

“By looking at the length of the wave, we can tell the time it came from in the history of the universe,” he added. “This particular signal is the first to have come to us from a fascinating time we know very little about: the time in which stars and galaxies began to form 13.5 billion years ago.”