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Superstar Eta Carinae’s Cosmic Rays May Reach Earth: Study

Astronomers know that cosmic rays with energies greater than one billion electron volts (eV) come to us from beyond our solar system.

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Superstar Eta Carinae's Cosmic Rays May Reach Earth: Study
Superstar Eta Carinae's Cosmic Rays May Reach Earth: Study. Pixabay
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Eta Carinae, the most luminous and massive stellar system within 10,000 light years, is accelerating particles to speeds comparable to that of light — some of which may reach Earth as cosmic rays, suggests a new study.

“We know the blast waves of exploded stars can accelerate cosmic ray particles to speeds comparable to that of light, an incredible energy boost,” said the lead author of the study Kenji Hamaguchi, an astrophysicist at NASA’s Goddard Space Flight Centre in Greenbelt, Maryland.

“Similar processes must occur in other extreme environments. Our analysis indicates Eta Carinae is one of them,” Hamaguchi said.

Astronomers know that cosmic rays with energies greater than one billion electron volts (eV) come to us from beyond our solar system.

But because these particles — electrons, protons and atomic nuclei — all carry an electrical charge, they veer off course whenever they encounter magnetic fields. This scrambles their paths and masks their origins.

For this study, published in the journal Nature Astronomy, the researchers used data from NASA’s NuSTAR space telescope.

Launched in 2012, NuSTAR can focus X-rays of much greater energy than any previous telescope.

Using both newly taken and archival data, the team examined NuSTAR observations acquired between March 2014 and June 2016, along with lower-energy X-ray observations from the European Space Agency’s XMM-Newton satellite over the same period.

“We’ve known for some time that the region around Eta Carinae is the source of energetic emission in high-energy X-rays and gamma rays,” said Fiona Harrison, the principal investigator of NuSTAR.

Carina Nebula
Carina Nebula. Pixabay

“But until NuSTAR was able to pinpoint the radiation, show it comes from the binary and study its properties in detail, the origin was mysterious,” said Harrison, who also serves as a professor of astronomy at California Institute of Technology (Caltech) in Pasadena.

Eta Carinae, located about 7,500 light-years away in the southern constellation of Carina, is famous for a 19th century outburst that briefly made it the second-brightest star in the sky.

This event also ejected a massive hourglass-shaped nebula, but the cause of the eruption remains poorly understood.

The system contains a pair of massive stars whose eccentric orbits bring them unusually close every 5.5 years.

Also read: Brain Damage Caused by Cosmic Rays Can be Prevented With this Drug

The stars contain 90 and 30 times the mass of our Sun and pass 225 million km apart at their closest approach — about the average distance separating Mars and the Sun. (IANS)

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Google Doodle Celebrates First Message of Humanity into Space

Astronomer and astrophysicist Frank Drake from Cornell University wrote the message with the help from American astronomer Carl Sagan, among others

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Google Doodle celebrates humanity's first message into space. (VOA)

In 1974, scientists sent humankind’s first, three-minute long interstellar radio message – the Arecibo Message – and 44 years later, Google on Friday celebrated the feat with a Doodle.

The Arecibo message is a 1974 interstellar radio message carrying basic information about humanity and Earth sent to globular star “cluster M13” 25,000 light years away, with a hope that extraterrestrial intelligence might receive and decipher it.

The message was sent from the Arecibo Observatory in Puerto Rico.

It had exactly 1,679 binary digits (210 bytes) which, if arranged in a specific way, can explain basic information about humanity and earth to extraterrestrial beings.

Doodle 4 google
Representational Image of ‘Doodle for Google’. Flickr

The message was broadcast into space a single time via frequency modulated radio waves.

Astronomer and astrophysicist Frank Drake from Cornell University wrote the message with the help from American astronomer Carl Sagan, among others.

Also Read- Social Circles Pose More Risks Online Than Strangers: Microsoft Study

“It was a strictly symbolic event, to show that we could do it,” Cornell University professor Donald Campbell was quoted as saying in an Independent report.

Since it will take nearly 25,000 years for the message to reach its destination — and an additional 25,000 years for a reply, if any, the Arecibo message is viewed as the first demonstration of human technological achievement. (IANS)