Special Observatories
There are special observatories which do not observe the light.
Moving in the opposite direction of the sky, we are now heading deep underground. 1000 meters.
To see a very different type of observatory. Housed in an abandoned mine in Japan.
This is the 'Super-Kamiokande”.
It detects extremely tiny particles called neutrinos.
These mysterious particles pass through almost anything without interacting with ordinary materials.
Even now, trillions of neutrinos are passing through our bodies.
Trapped inside casing, so deep underground, helps stop other particles getting in,
for better observation.
A long time ago in a galaxy far, far away, two black holes collided.
The fluctuation of space-time induced by this collision was detected on Earth,
more than hundreds of millions of light years away at the LIGO twin observatories.
It's a gravitational wave. A shaking of the very fabric of space and time.
Predicted by Einstein but never seen until now.
It's such a tiny change that it took more than a decade of study
at LIGO to detect this universe-shaking event echo from so far away.
LIGO, Laser Interferometer Gravitational-Wave Observatory. USA
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