[math-fun] supersupersupersuper nova
A supernova exploded. It then appeared 4 times in 4 places in the sky. This seems to prove gravitational lensing happens... in case anybody doubted it, it now seems a lot more proven. The relative time delays are of order 10-100 years and more images of it will probably come to those who wait another 10-100 years. http://www.eurekalert.org/pub_releases/2015-03/uoc--dss022515.php
Even Newtonian gravity predicts light will be bent, just a different amount. I read somewhere that "Einstein lensing" should always produce an odd number of images(?) Rich ----- Quoting Warren D Smith <warren.wds@gmail.com>:
A supernova exploded. It then appeared 4 times in 4 places in the sky. This seems to prove gravitational lensing happens... in case anybody doubted it, it now seems a lot more proven. The relative time delays are of order 10-100 years and more images of it will probably come to those who wait another 10-100 years.
http://www.eurekalert.org/pub_releases/2015-03/uoc--dss022515.php
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The NY Times story included mention of the "Einstein halo" — a ring seen when a supernova, a large amount of mass, and an earthling eye are lined up. Is a circle an odd number? --Dan
On Mar 5, 2015, at 2:29 PM, rcs@xmission.com wrote:
I read somewhere that "Einstein lensing" should always produce an odd number of images(?)
participants (3)
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Dan Asimov -
rcs＠xmission.com -
Warren D Smith