Hubble And Black Holes

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Hubble And Black Holes Tube. Duration : 9.18 Mins.

www.facebook.com ... Hubblecast 43: Hubble and Black Holes. For centuries, scientists imagined objects so heavy and dense that their gravity might be strong enough to pull anything in - including light. They would be, quite literally, a black hole in space. But it's only in the past few decades that astronomers have conclusively proved their existence. Today, Hubble lets scientists measure the effects of black holes, make images of their surroundings and glean fascinating insights into the evolution of our cosmos. --- Please SUBSCRIBE to Science & Reason: • www.youtube.com • www.youtube.com • www.youtube.com --- In science fiction, black holes are often portrayed as some kind of menacing threat to the safety of the whole Universe, like giant vacuum cleaners that suck up all of existence. Now, in this episode, we're going to separate the fiction from the facts and we're going to look at the real science behind black holes and how Hubble has contributed to it. Black holes come in different sizes. We've had solid evidence for the smaller ones since the 1970s. These form when a huge star explodes at the end of its life. As the outer layers are blown away, the star's core collapses in on itself forming an incredibly dense ball. For instance, a black hole with the same mass as the Sun would have a radius of only a few kilometres. These black holes won't suck you in unless you get very close to them though. In fact, contrary to popular belief, a black hole the size of the Sun ...
Tags: black holes, black, holes, gravity, hubble, space, telescopes, light, cosmos, science, fiction, universe, radius, sun, stellar, galaxies, massive, supermassive, star, clusters, galactic, centre, rotating, discs, gas, dust, astronomers, astronomy