bend spacetime stretches light waves. “It seems to me that the expansion and contraction effects of the waves on the [LIGO] detector and surroundings would also apply equally to the wavelength of the light beams used by the detector,
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,” Toot wrote. “If so,
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, it then seems like the impact on phase difference between the recombinant beams would net out to zero phase shift. That clearly didn’t happen. Why not?”
It’s true that gravitational waves affect both the LIGO observatory and the laser light. However, the interferrometer contains two perpendicular arms,
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, says Tom Siegfried,
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. While one arm is shortened by the wave,
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, the other is lengthened. Since the speed of light remains the same in both arms, the change in arm lengths means the two laser beams will not arrive at the same time. Because of this setup,
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, the change in the light’s wavelength is irrelevant.

Folsom arachnid


Researchers discovered a new species of tarantula that lives near the grounds of Folsom State Prison in California,
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, Helen Thompson reported (SN: 3/5/16, p. 5). Clad entirely in black,
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, the fearsome-looking but relatively harmless creature was named after the iconic man in black himself?—?Johnny Cash. That inspired some online readers to arachnify some of Cash’s lyrics:

[img]/sites/default/files/2016/04/main/articles/051416_feedback_sidebarhttp://revoltechgaming...rum_topic&topic=87315

http://users.atw.hu/pr...ews_comments&newsID=2

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