Tag Archives: BLACK HOLES

A Star Orbiting in the Extreme Gravity of a Black Hole Validates General Relativity

At the center of the Milky Way galaxy, nearly 26,000 light-years away, a cluster of stars circles close to the supermassive black hole known as Sagittarius A*. As these few dozen stars, called S-stars, approach the black hole—which is about four million times more massive than the sun—its immense gravitational force whips them around faster than 16 million miles per hour. In fact, the gravitational pull of Sagittarius A* is so intense that it warps the light from these stars when they stray too close, stretching the wavelengths toward the red part of the electromagnetic spectrum. Continue reading A Star Orbiting in the Extreme Gravity of a Black Hole Validates General Relativity

Astronomers Capture First-Ever Image of a Supermassive Black Hole

At the center of a galaxy called Messier 87, about 55 million light-years away, about which all of the matter of the galaxy orbits, there lies a monster: a supermassive black hole. With about 6.5 billion times the mass of the sun, the black hole at the center of M87 is so dense that its escape velocity, or the velocity needed to escape the object’s gravity, is more than the speed of light. Accordingly, not even photons of light can escape once they wander too close.

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Supermassive Black Hole Stretches Starlight, Proving Einstein Right Again

Albert Einstein’s theory of general relativity is magnificent. For a hundred years, it has consistently predicted all sorts of wacky phenomena scientists have later observed throughout space. One international team is now announcing that a 26-year-long observation campaign has once again confirmed the theory. Continue reading Supermassive Black Hole Stretches Starlight, Proving Einstein Right Again

New Evidence That Supermassive Black Holes Eventually Suck the Life out of Big Galaxies

At the core of each large galaxy lies a supermassive black hole with the mass of 1 million suns. New research shows that these celestial vacuum cleaners do more than just devour nearby objects—they also grow to a size that eventually suppresses a galaxy’s ability to churn out new stars, effectively rendering them sterile.

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Wild Theory Suggests Heavy Metals Came From Black Holes

If you were to rank the wildest things in the universe, there are a few obvious contenders: gamma rays, fast radio bursts, and quasars, for example. But no list would be complete without black holes and the black hole’s less-dense cousins, the neutron star. These hyper-compressed things can do some mind-boggling warping to the shape of space itself. So, what happens if one were to eat the other?

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