From a distance of about 8 billion light-years, scientists find a huge cosmic laser beam pointing toward Earth.
A team of astronomers has discovered a truly amazing phenomenon deep in the universe: a giant cosmic laser beam pointing towards Earth from a distance of about 8 billion light-years.
This is the brightest and most distant megamaser ever detected, an extremely rare signal discovered thanks to a strange effect in spacetime predicted by Albert Einstein more than a century ago. What the researchers detected is a hydroxyl megamaser, a powerful emission of electromagnetic radiation in the form of microwaves.
This type of signal is generated during violent collisions between galaxies. When two galaxies merge, enormous clouds of gas are subjected to extreme pressure, which activates large quantities of hydroxyl molecules, releasing energy in the form of high-intensity microwaves.
This process is somewhat similar to a homemade laser. In these devices, particles emit light that is amplified by mirrors. In the case of masers, the process is similar, but instead of visible light, microwaves are amplified.
Scientists detected this signal using the MeerKAT observatory, a radio telescope with 64 antennas located in South Africa.
This radiation is emitted from a colliding galaxy system known as HATLAS J142935.3–002836, which was discovered in 2014. The microwave wavelength emitted from this system is about 18 centimeters and is much more intense than that emitted from other known megamaser sources.
Given its exceptional brightness, researchers speculate that it may be a gigamaser, a more extreme theoretical classification within this type of phenomenon.
The signal is very old, dating back to a time when the universe was about half its current age, making it the most distant megamaser ever detected.
Its discovery was only possible thanks to a phenomenon called gravitational lensing. This effect occurs when light or radiation from a very distant object is bent as it travels through space by the gravity of a massive object located between the source and the observer.
From our perspective, this distortion can create luminous structures known as Einstein rings, and it amplifies the original signal, allowing telescopes to detect objects that would have been too faint under normal conditions.
According to the study's lead author, this system is "truly extraordinary," representing the radio equivalent of a laser beam arriving from the middle of the visible universe.
The team now plans to continue using the MeerKAT observatory to search for more similar laser sources in systems affected by gravitational lensing. The goal is to find hundreds or even thousands of these rare cosmic beacons, which could provide new clues about how galaxies form, evolve, and disappear.