Today I Learned
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https://en.wikipedia.org/wiki/Portland,_Oregon
https://en.wikipedia.org/wiki/Portland,_Maine
it's roughly 3000 miles from portland to portland
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The idea of a body so massive that even light could not escape was first proposed in the late 18th century by English astronomer and clergyman John Michell and independently by French scientist Pierre-Simon Laplace. Both scholars proposed very large stars in contrast to the modern concept of an extremely dense object.
Michell's idea, in a short part of a letter published in 1784,[6] calculated that a star with the same density but 500 times the radius of the sun would not let any emitted light escape; the surface escape velocity would exceed the speed of light.
what's funny is that he even got the radius (schwarzschild-radius) right. just plug in c for the escape velocity and you get the schwarzschild-radius.
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TIL that nearly half of US adults struggled to afford healthcare last year
(coloradonewsline.com)
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