Event Horizon Telescope will soon take the first
black hole photo
But you might have to wait until 2018 to see what black holes actually look like.
Mariella Moon, @mariella_moon 02.19.17 in Space
The Event Horizon Telescope (EHT) is finally ready to take a picture of Sagittarius A*. From April 5th to 14th this year, the virtual telescope that's been in the making for the past two decades will peer into the supermassive black hole in the center of our galaxy. EHT is actually an array of radio telescopes located in different countries around the globe, including the Atacama Large Millimeter/submillimeter Array in Chile.
By using a
technique called very-long-baseline
interferometry, the EHT team turns all the
participating observatories into one humongous
telescope that encompasses the whole planet.
We need a telescope that big and powerful, because
Sagittarius A* is but a tiny pinprick in the sky
for us. While scientists believe it has a mass of
around four million suns,
only measures around 20 million km or so across
and is located 26,000 light-years away from our
planet. The EHT team says it's like looking
at a grapefruit or a DVD on the moon from Earth.
the participating observatories, the team equipped
them with atomic clocks for the most precise time
stamps and hard-drive modules with enormous
storage capacities. Since the scientists
are expecting to gather a colossal amount of data,
they deployed enough modules to match the capacity
of 10,000 laptops. Those hard drives will be flown
out to the MIT Haystack Observatory, where imaging
algorithms will make sense of EHT's data, once the
observation period is done.
researchers said it could take until the beginning
of 2018 before we see humanity's first photo of a
black hole. As for what they're expecting
to see, it'll be something like what their
simulation yielded last year:
Based on Einstein's theory of general relativity, we're supposed to see a crescent of light surrounding a black blob. That light is emitted by gas and dust before the black hole devours them, while the dark blob is the shadow cast over that mayhem. But what if we see something else altogether? Team leader Sheperd Doeleman from the Harvard-Smithsonian Center for Astrophysics told BBC:
"As I've said before, it's never a good idea to
bet against Einstein, but if we did see something
that was very different from what we expect we
would have to reassess the theory of gravity."
[Image credit: NASA/UMass/D.Wang et al., IR: NASA/STScI / Feryel Ozel (event horizon simulation)]
In this article: blackholes, eventhorizontelescope, science, space, TheoryOfRelativity