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[BBC] Einstein theory passes black hole test

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Mr. Man-wai Chang
Guest

Sat Jul 28, 2018 12:45 pm   



[BBC]Einstein theory passes black hole test
Full story: https://www.bbc.com/news/science-environment-44967491

The black hole at the centre of our galaxy has helped astronomers
confirm a key prediction of Albert Einstein's ideas.

By observing a cluster of stars near the hole, they were able to confirm
a phenomenon known as "gravitational redshift".

It's when the wavelength of light gets stretched out in response to a
gravitational field.

The result will help scientists better understand the physics of black
holes.

The Very Large Telescope (VLT) in Chile found evidence for Einstein's
prediction by observing a star, called S2, that passed through the
intense gravitational field of Sagittarius A* - the huge black hole at
the heart of the Milky Way.

The effect they observed, gravitational redshift, occurs as particles of
light (photons) climb out of a gravitational well like a black hole. As
they do, the light's wavelength gets drawn out.
Image copyright Getty Images
Image caption Albert Einstein would no doubt be delighted

This shifts the wavelength to the red part of the light spectrum - hence
"redshift".

It's predicted by Einstein's theory of general relativity, but has never
been observed in an intense gravitational field such as that of a black
hole.

..... more .....


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George Herold
Guest

Mon Jul 30, 2018 2:45 pm   



On Saturday, July 28, 2018 at 7:11:26 AM UTC-4, Mr. Man-wai Chang wrote:
Quote:
[BBC]Einstein theory passes black hole test
Full story: https://www.bbc.com/news/science-environment-44967491

The black hole at the centre of our galaxy has helped astronomers
confirm a key prediction of Albert Einstein's ideas.

By observing a cluster of stars near the hole, they were able to confirm
a phenomenon known as "gravitational redshift".

It's when the wavelength of light gets stretched out in response to a
gravitational field.

Your GPS has to account for the gravitational redshift to get the timing
right.
https://en.wikipedia.org/wiki/Gravitational_redshift

(aside, the above has a link to the Pound-Rebka experiment...
those guys should have gotten a noble prize for it! Well
and Pound for NMR too... anyway.)

George H.
Quote:

The result will help scientists better understand the physics of black
holes.

The Very Large Telescope (VLT) in Chile found evidence for Einstein's
prediction by observing a star, called S2, that passed through the
intense gravitational field of Sagittarius A* - the huge black hole at
the heart of the Milky Way.

The effect they observed, gravitational redshift, occurs as particles of
light (photons) climb out of a gravitational well like a black hole. As
they do, the light's wavelength gets drawn out.
Image copyright Getty Images
Image caption Albert Einstein would no doubt be delighted

This shifts the wavelength to the red part of the light spectrum - hence
"redshift".

It's predicted by Einstein's theory of general relativity, but has never
been observed in an intense gravitational field such as that of a black
hole.

.... more .....


--
@~@ Remain silent! Drink, Blink, Stretch! Live long and prosper!!
/ v \ Simplicity is Beauty!
/( _ )\ May the Force and farces be with you!
^ ^ (x86_64 Ubuntu 9.10) Linux 2.6.39.3
不借貸! 不詐騙! 不賭錢! 不援交! 不打交! 不打劫! 不自殺! 不求神! 請考慮綜援
(CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa


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