Biggest known black hole was detected

One of the most cataclysmic events in the universe was detected despite barely making a ripple by land.

An international team, including Australian scientists, discovered space and time wrinkles, known as gravitational waves, of the most well-known skirmishes of binary black holes that have produced a new black hole about 80 times greater than the sun.

Although the collision happened 9 billion years ago, the ripples only made it to Earth last year, and it was not discovered until the year. The detection, announced on Tuesday, is the ultimate success, and one of the biggest for the Advanced Laser Interferometer Gravitation-Wave Observatory (Ligo).

The team depleted the gravitational waves passed by land on July 29, 2017, followed by three other small black hole mergers in Aug. 2017 by regenerating data previously captured by Advanced Ligo.

The discovery brings the total number of black hole merger detections to 10, along with a neutron star collision, during the past three years. Australian team's Professor Susan Scott says she has spent most of her career hoping to detect gravitational waves and technology advances are finally giving researchers.

This event also has black holes spinning the fastest of all mergers observed so far and it is the most distant fighter in the universe ever noticed, Prof Scott said.

"We can not see the events any other way, except by gravitational waves, as they do not export light or radio waves … because they are black holes," she tells AAP.

The binary systems are two black holes orbiting each other, eventually crushing together and shaking powerful gravitational waves that are very weak by the time they reach the ground, said Prof Scott, of the Australian Research Center of Excellence for Gravitational Wave Discovery (Ozgrav) . The deposition will improve scientists understand how many binary black hole systems there are in the universe and the range of their muscles and how fast they spin during a merger, she said.

Researchers plan to use Ligo's technology to detect cataclysmic events even further out in place, in the hopes they can reach back to the beginning of time. The next observation flow to collect data will begin early next year, following work to make the gravitational wave detector more sensitive. Prof Scott will present the latest results at the Australian Institute of Physics Congress in Perth exactly this month and the discovery will be published in Physical Review X at a later date.

"This should be the biggest announcement in the whole congress … It's a top of my career," she said.

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