Confirmed! Monster black hole at center of Milky Way galaxy

The enormous object with a mass of millions of suns at the center of our galaxy, 26,000 light-years away from the Earth, has long been believed to be a supermassive black hole. Now we have proof:

Researchers used the European Southern Observatory’s sensitive GRAVITY instrument on the Very Large Telescope (VLT) to observe infrared radiation flares coming from the accretion disc around Sagittarius A* — the massive object at the center of our galaxy. Scientists think that most galaxies have a supermassive black hole at their center, but they’d never before had the data and observations to prove it.

To measure the effects of gravity near to a black hole, scientists needed to observe an object actually traveling close to it. They found their mark in a small star called S2 whose orbit takes it deep within Sagittarius A*’s gravity well every 16 years. As they watched, they saw three bright flares traveling around the black hole’s event horizon at about 30 percent of the speed of light — around 216 million miles per hour.

It’s exactly what Einstein’s theory of general relativity predicts would occur when a hot spot (like S2) passes close to a black hole weighing as much as 4 million suns, and the observation helps to confirm that it’s really there.

Never before have scientists observed material orbiting so close to a black hole’s event horizon.

Oh, and in case you were worried:

If the Milky was does in fact have a black hole in the center, will the entire Milky Way eventually be drawn in, (like vacuuming a sheet off of a bed), or are certain parts too far away? Is there a big sphere of empty space around a black hole?

No, the popular picture of a black hole as a huge vacuum cleaner sucking in everything around it is inaccurate. Black holes, even the one at the center of our galaxy, are very small. Only if you get very close to a black hole’s event horizon does it start pulling everything in. So no, most of the galaxy will not eventually fall into the hole. Whether black holes have empty space around them or not depends on their environment. There may be objects or gas close enough to fall in, or there may not be. Many black holes have disks of infalling material around their equators. –Dave Kornreich

Sagittarius A NASA

Supermassive black hole Sagittarius A* (Source: NASA)

Daily links: Movies, Mars, and ancient nematodes

Steel Rain movie

Steel Rain

A large underground lake of liquid water is discovered on Mars.

Two Russian nematodes are brought back to life after being frozen for nearly 42,000 years, making them the oldest living animals currently on earth.

European astronomers track a star travelling through the gravitational field of Sagittarius A*, the supermassive black hole at the center of the Milky Way galaxy, and it exhibits gravitational redshift, confirming Einstein’s predictions.

Massive, brutal vivisection of Star Wars: The Last Jedi, via a series of YouTube videos deconstructing the film’s appalling writing. It’s a dirty job, but someone has to do it. The franchise will never recover from this.

Review of the South Korean spy thriller Steel Rain. I watched this on a flight from Seoul to New York. It’s good.

David Goldman challenges American complacency about China’s rise.

Russia liquidates more than 84% of its US Treasury holdings in the two months through May 31, leaving experts puzzled.