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Their masses merge. the gravitational forces become so massive that the matters into his think point called the singularity. black holes start small but as they suck up more and more material in their path they can begin to grow and eventually become super massive black holes like the one at the center of our galaxy the milky way. with the mass and the gravitational pull of four million stars like our sun. so far astronomers have been unable to see the milky way's central super massive black hole directly they inferred its existence from the motion of the stars orbiting around. the event horiz...

International cooperation the behind the ability to capture these images this whole project wouldn't be possible without international cooperation there were eight telescopes so far in this network which where working together very very expensively there where using atomic clocks for example that use only one second every million every hundred million years so it's very accurate and it's needed they they need those difference pots on on earth to really observe of and to gather all those states have because imagine it's very foul way this black hole they observe now is at the center of a galaxy...

That this idea they're very big weight transforms geometry that when the masses to has he you make a hole a mysterious hole where nothing can get out of it where all its absorbed. astronomers can't see the milky way's black hole they inferred its existence from the strange orbit of the stars around it. and they say you'd need a radio telescope as large as the earth to image the hot matter swirling at the event horizon of the black hole but by using the telescopes in various locations synchronized with atomic clocks they could gather enough data to create this remarkable image. you may wonder h...

Been unable to see the milky way's central super massive black hole directly be inferred its existence from the motion of the stars orbiting around it. the event horizon telescope has spent two years gathering signals from the black hole at the center of our galaxy the telescope is actually a global network of synchronized radio observatories the coordinated with atomic clocks to synchronize them and all that data is combined after the fact into what's called a correlator and that correlator as ultimately produces data that can be constructed into an image and that image will be the first time...

>> dr. matsakas is talking about his job at the u.s. naval observatories time service department. >> we provide the official time for gps and via gps, it goes to much of the world. >> so it's not an exaggeration to say, you are the time keeper. >> yes, we are the time keeper. >> and keeping time, precise time, is important. for the financial system, for the internet, for the pentagon. the department has more than 100 atomic clocks, and there are three different types. one measures the oscillation of atoms. how often does the atom oscillate in one second? >> that's a definition of a second. >> ...