Cypress (01-09-2019), domer76 (01-09-2019), dukkha (01-09-2019), evince (01-11-2019), LV426 (01-10-2019), Phantasmal (01-09-2019), signalmankenneth (01-09-2019), ThatOwlWoman (01-09-2019)
Scientists have peered at the very beginning of the universe, sampling light that was emitted at the dawn of time.
And the breakthrough is the consequence of a happy accident: a galaxy acted as a huge space telescope, bending light so that we could see deep into space and time.
The light that reached Earth was among the first to ever twinkle on after the Big Bang.
Astronomers now hope they are able to make yet more similar discoveries, allowing them to watch as the universe began.
The observations allowed scientists to pick up part of an extremely distant quasar, sending out a beam of light that is almost as old as the universe itself.
https://www.independent.co.uk/news/s...-a8720016.html
“If we have to have a choice between being dead and pitied, and being alive with a bad image, we’d rather be alive and have the bad image.”
— Golda Meir
Zionism is the movement for the self-determination and statehood for the Jewish people in their ancestral homeland, the land of Israel.
“If Hamas put down their weapons, there would be no more violence. If the Jews put down their weapons, there would be no Israel."
ברוך השם
Cypress (01-09-2019), domer76 (01-09-2019), dukkha (01-09-2019), evince (01-11-2019), LV426 (01-10-2019), Phantasmal (01-09-2019), signalmankenneth (01-09-2019), ThatOwlWoman (01-09-2019)
I have this feeling that 'time' pulsates with the Big Bang and the Big Crunch.
Guno צְבִי (01-09-2019)
evince (01-11-2019), Guno צְבִי (01-09-2019)
Another report on this story:
https://phys.org/news/2019-01-cosmic-telescope.html
Cypress (01-09-2019), dukkha (01-09-2019), evince (01-11-2019), Guno צְבִי (01-09-2019), Phantasmal (01-09-2019)
I thought this thread was going to be about the birth of Ruth Bader Ginsberg.
evince (01-11-2019), Gotcha68 (01-09-2019), ThatOwlWoman (01-09-2019)
Truth Detector (01-10-2019)
dukkha (01-09-2019), evince (01-11-2019), Guno צְבִי (01-09-2019), ThatOwlWoman (01-09-2019)
evince (01-11-2019), Guno צְבִי (01-09-2019), Nomad (01-09-2019)
evince (01-11-2019)
Much obliged.
As a struggling undergraduate, I could never understand why Einstein's theory of general relativity predicted that the mass of large bodies, such as stars, could bend light - good grief, photons have no mass!! How on Earth would a gravitational force deflect something that has no mass??!
Then I had an excellent physics professor who finally explained gravity and relativity in a way I could grasp: Gravity is not actually a "force" in the way Newtonian physics considers it. Rather, in Einstein's relativity it is a curvature of space-time. Simply put, gravity is not a force -- it is geometry, aka a fundamental geometric property of the cosmos.
Out of about five dozen physicists I have heard try to explain relativity, it took that one guy to explain it in a way that was easy to grasp and was totally intuitive.
The bottom line: good science teachers are far and few between, and I am convinced that this artificial division between the humanities and the natural sciences needs to be broken down - because most scientists need a crap load more training in writing, communication, and rhetoric!
evince (01-11-2019), Phantasmal (01-10-2019), ThatOwlWoman (01-10-2019)
Teachers like that are precious as diamonds, eh?
I never took physics but Mr. Owl has. He also explained gravity the same way. I think that was one of Stephen Hawking's greatest gifts -- that he could take the most esoteric and complex subjects in human thought and translate them into the-rest-of-us-speak.
Now I want to go re-read A Brief History of Time.
Good explanation of gravity lensing:
https://astronomy.stackexchange.com/...tional-lensing
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