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Pulsar-dwarf star system shows Einstein more than relatively right
Lisa Boxx Show this Post
04-27-2013, 03:55 AM #1
Lisa Boxx Incognito
 
Albert Einstein has been dead for nearly 60 years, relatively speaking, and he’s still being tested. Theoretically, at least.

General relativity, the theory for which the German-born theoretical physicist is best known, holds up even in the more outlying phenomena of distant space, scientists have found.

Astronomers studied a neutron star about 7,000 light years from Earth that is twice as heavy as our sun but only about 12 miles in diameter. The gravity of this spinning, highly magnetic star, or pulsar, is about 300 billion times stronger than the force that’s holding your feet to the ground. A companion white dwarf is what remains of a much lighter star that is dying out.

The tightly spaced pulsar-dwarf pair, rotating around each other in under three hours, allows scientists to test alternative theories of gravity. It’s also a candidate for showing “deviations” in Einstein’s formulas. As the orbits decay, gravitational waves are emitted, sapping energy from the system. Astronomers used Einstein’s equations to calculate the amount of gravitational radiation emitted, then tested to see if it accurately predicted the rate of orbital decay.

"We thought this system might be extreme enough to show a breakdown in General Relativity, but instead, Einstein's predictions held up quite well," Paulo Freire of Germany's Max Planck Institute for Radioastronomy said in a written statement.

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04-27-2013, 04:05 AM #2
Octo Mother Superior
Posts:41,476 Threads:1,587 Joined:Feb 2011
I think I'd better sleep a little and get back to you on this.
Anonymous Kritter Show this Post
04-27-2013, 05:11 AM #3
Anonymous Kritter Incognito
 
12 miles in diameter!damned.gif

Wow! I thought that would qualify for a black hole!

Guess I need to degree to know such things :(
Anonymous Kritter Show this Post
04-27-2013, 05:11 AM #4
Anonymous Kritter Incognito
 
(04-27-2013, 04:05 AM)Octo Wrote:  I think I'd better sleep a little and get back to you on this.


You think that'll help?chuckle.gif
04-27-2013, 05:20 AM #5
オタマジャクシ Member
Posts:1,098 Threads:31 Joined:Nov 2012
(04-27-2013, 05:11 AM)Anonymous Kritter Wrote:  12 miles in diameter!damned.gif

Wow! I thought that would qualify for a black hole!

Guess I need to degree to know such things :(


Event horizon for a sun sized black hole is a little under 6 kilometers (4 miles). Event horizon for sun x 2 is 8.4 km or 5.6 miles.
Lisa Boxx Show this Post
04-27-2013, 09:58 AM #6
Lisa Boxx Incognito
 
(04-27-2013, 04:05 AM)Octo Wrote:  I think I'd better sleep a little and get back to you on this.


Yes Octo. You sleep and then get out the slide rule and white board

lmao.gif

damned.gif
04-27-2013, 10:18 AM #7
JayRodney ⓐⓛⓘⓔⓝ
Posts:30,253 Threads:1,493 Joined:Feb 2011
I wondered why she got up in the middle of the night and started writing equations on the blackboard coffeetime.gif chuckle.gif From the looks of things, I think she nailed it.

wonder.gif

04-27-2013, 10:33 AM #8
Accidental Stoner Member
Posts:8,599 Threads:80 Joined:Feb 2011
Interesting article...yeah, Einstein had beautiful vision,
whether right or wrong or relatively so.

coffeetime.gif



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