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THE FIRST IMAGE OF BLACK HOLE
-We are looking into space, into towards galaxy, a giant galaxy 53.5
million light-year away from us. A very very big galaxy which was
suspected to host a supermassive black hole in the very center.
Hundred and one year ago someone discovered a streak of light which
is plasma shooting out of center of the Milky Way (Our galaxy) marking
the supermassive black hole. I never believed that this black hole as big
as people said until we saw that. This is the nuclear of galaxy Messier87
(M87) and the first ever image of the black hole.

What is black hole?
-A black hole is a region of spacetime exhibiting such strong
gravitational effects that nothing—not even particles and
electromagnetic radiation such as light—can escape from inside it.
-At the very center of the black hole is Singularity. A region where the
spacetime curvature becomes infinite. A point that break all the physic
laws.
-The boundary of the region from which no escape is possible is called
the event horizon. That means if you go there, you will never comeback.


Type of Black hole
ACCORDING TO THE THEORY, THERE ARE 3 TYPE OF BLACK HOLE:
-Stellar Black hole from when a massive star collapses. They have mass
ranging from about 5 to several tens of our Sun’s mass.
-Primordial black hole, which would have mass much smaller than that
of our Sun. No one has ever discovered a miniature black hole but it's
possible that primordial black holes could have formed shortly after the
"Big Bang," which is thought to have started the universe 13.7 billion
years ago.
-Supermassive black hole, which can have a mass equivalent to billions

of suns, likely exist in the centers of most galaxies, including our own
galaxy. And the image we saw is this type of Black hole.

How the image was made?
- A black hole isn't an easy thing to photograph, not even the light can
escape from it. By definition, they are invisible. So how can you take a
picture of a black hole?


-Actually we can “see” it’s shadow. Despite that fact, we still need an
earth-size telescope which clearly impossible to made to take picture of
a black hole. But build one earth-size telescope is imposible so they put
telescopes across the globe banded together to form a consortium
known as the Event Horizon Telescope (EHT).
-Event Horizon Telescope (EHT) is an international collaboration that has
formed to continue the steady long-term progress on improving the
capability of Very Long Baseline Interferometry (VLBI) at short
wavelengths in pursuit of this goal. This technique of linking radio
dishes across the globe to create an Earth-sized interferometer.
-the picture was form by 8 telescope:
+ South Pole Telescope (SPT)
+ Northern Extended Millimeter Array (NOEMA)
+ IRAM 30-meter telescope
+ Atacama Large Millimeter/Submillimeter Array (ALMA)
+ Atacama Pathfinder EXperiment (APEX)
+ James Clerk Maxwell Telescope (JCMT)
+ The Submillimeter Array (SMA)
+ Arizona Radio Observatory/Submillimeter-wave Astronomy (ARO/SMT)
+ The Large Millimeter Telescope (LMT)

-Processing the massive amount of the data of eight telescopes can
generate was a challenge in its own right. Katie Bouman, a scientist of
MIT, had to develop algorithms to take 5 petabytes of data and make
sense of it.
-It’s just like a puzzle with infinite number of possibilities. How do we
know which one is right? Even we already have few sample or
simulations of black hole, But we don’t know those simulations is right
or not. In fact, a lot of things different in reality compare to theories
more or less.


-But they had overcome all of it and confirm the theory of Albert
Einstein about black hole.
-Thank EHT collaboration for proving that Black hole does exit and
taking us one more step further on discover the universe.
Thank you for listening.