Earth received a radio signal sent from a galaxy nine billion light years away.


The Radio Signal was captured by Giant's Metrowave radio telescope in Pune, India.

 January 2023 became the month of publishing this discovery of "Radio Signal".

The giant radio telescope contains an array of 30 antenna dishes, all facing the sky, with each dish about 150 feet in diameter.

Using this sophisticated telescope technology, the scientist discovered a unique radio signal with a unique wavelength known as the 21 cm line or hydrogen line. This signal is emitted by neutral hydrogen atoms.

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Unfortunately, this unique signal did not come from extraterrestrial life. Emitted from a galaxy named SDSSJ0826+5630. The galaxy is a "star-forming galaxy".

The interesting thing about radio signals is that the Milky Way (of which the Earth is part) was emitted when it was only 4.9 billion years old. The Milky Way is currently estimated to be 13.8 billion years old.

Therefore, it took nine billion years for the signal to reach Earth. For scientists, radio signals are a way to travel back in time nine billion years ago.

Other radio signals from nearby galaxies have been found, but this is the farthest so far.

Radio Signals from SDSSJ0826+5630 have allowed scientists to measure the mass and gas content of the galaxy. With this information, scientists note that a distant galaxy may have twice the mass of a star visible from Earth.

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