Huge black hole at the centre of our galaxy suddenly emits mysterious glow

Black hole, illustration. A black hole is an object so compact (usually a collapsed star) that nothing can escape its gravitational pull. Not even light. This black hole is surrounded by a superheated disc of material, an accretion disc, making it visible. The massive gravity is also pulling in a nearby gas cloud, top right.
What made the black hole turn bright so suddenly? (Getty)

The supermassive black hole at the heart of our galaxy suddenly glowed far, far brighter than normal - becoming 75 times more luminescent - before going back to normal.

Scientists are trying to figure out why. It’s the brightest ‘glow’ ever seen from the black hole, known as Sagittarius A*, measured in near-infrared wavelengths.

Tuan Do of the University of California Los Angeles told ScienceAlert of the event that happened in May, ‘I was pretty surprised at first and then very excited.

‘The black hole was so bright I at first mistook it for the star S0-2, because I had never seen Sgr A* that bright.

‘Over the next few frames, though, it was clear the source was variable and had to be the black hole.

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‘I knew almost right away there was probably something interesting going on with the black hole.’

Sagittarius A* is thought to pull in stars, gas clouds and planets, devouring them with its huge gravity.

Supermassive black holes are common in the centers of galaxies and may generate the most energetic phenomena in the known universe.

Researchers believe that the strange ‘glow’ may relate to gas clouds or stars which orbit the enormous black hole.

Do told Science Alert, ‘One of the possibilities, is that the star S0-2, when it passed close to the black hole last year, changed the way gas flows into the black hole, and so more gas is falling on it, leading it to become more variable.’

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