Astronomers at National Aeronautics and Space Administration (NASA) unearthed a mystery signal which further confirmed the fact that the Universe is such a huge place which is full of the unknown.

According to an article from NASA, a team of over half dozen NASA astronomers explored a swarm of galaxies called Perseus Cluster using the Chandra X-ray Observatory. The Perseus cluster resembles a cloud of gas wherein each individual atom I an entire galaxy.

These galaxies are around 250 million light years away from the Earth and are considered as one of the gigantic known objects in the entire Universe.

The astronomers reported that the mystery they discovered resides at the Perseus cluster which is submerged in a gigantic "atmosphere" of superheated plasma.

Esra Bulbul and her colleagues from the Harvard Center for Astrophysics examined the data gathered from the Perseus Cluster in 2012 when they found out a mysterious line that popped up. Bulbul stated that she could not believe her eyes on the astonishing discovery.

"What we found, at first glance, could not be explained by known physics," Bulbul stated.

The mysterious spectral signature resembled with that of the x-ray emissions coming from a completely separate group of 73 other galaxy clusters. The data coming that galaxy cluster were gathered through another x-ray telescope called Europe's XMM-Newton.

After Bulbul's team posted their report online, a different group of scientist from Netherlands also reported some evidence for the same mysterious spectral signature. It appeared that the spectral line did not originate from any known type of matter. To which, the astronomers shifted their suspicion to the uknown dark matter.

Bulbul revealed that theoreticians had derived around 60 various types of dark matter but the line could still not be explained. There were even some particle physicist who jestingly called the mysterious signal a "bulbulon."

NASA reported that it may need a while new observatory to solve the mysterious signal. The Japanese space agency planned to launch a more advanced telescope called "Astro-H" by 2015. The telescope contains a new type of x-ray detector which was collaboratively developed by scientists from NASA and the University of Wisconsin.

With better telescope capability, the mysterious signal that Bulbul's team unearthed two years ago will have more precise measurements that what is possible at present. By then, Physics might have an explanation of the mysterious signal the astronomers discovered.

"Maybe then we'll get to the bottom of this," Bulbul stated.

Watch the YouTube video of the Mysterious Signal that NASA Astronomers Discovered.

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