(Roughly) Daily

“Any eavesdropping alien civilization will know all about our TV programs (probably a bad thing), will hear all our FM music (probably a good thing)*…

 

The speed of light, at which radio waves propagate into space, is fast– really fast– but it’s not instant.  So what a space traveler would hear at ever-greater distances from Earth is an ever-older playlist of radio hits.

Hear them for yourself at Lightyear.fm.

* “FM signals and those of broadcast television…[travel] out to space at the speed of light. Any eavesdropping alien civilization will know all about our TV programs (probably a bad thing), will hear all our FM music (probably a good thing), and know nothing of the politics of AM talk-show hosts (probably a safe thing)…”

-Neil DeGrasse Tyson, Death By Black Hole, p. 172

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As we aim for about 50 LY out, we might recall that it was on this date in 1850 that Harvard Observatory director William Cranch Bond and Boston photographer John Adams Whipple took a daguerreotype of Vega– the first photograph of a star ever made.

 source

 

Written by LW

July 17, 2015 at 1:01 am

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