The Impossible History of Perpetual Motion
On November 12th, 1717, clockmaker and mechanic Johann Bessler placed a 12-foot diameter, strange-looking wheel into a room. With a tender push, he started the contraption rotating, then confidently turned and strolled outside. Guards promptly secured and locked the door behind him. Nobody would be allowed to enter the room for two weeks, lest the…
Physics & Chemistry
Ross Pomeroy - RealClearScience
This alien world shouldn’t even exist
What you’re looking at could be a planet being born some 176 light-years away from Earth. It’s a small planet, only 6 to 28 times Earth’s mass. But that’s not even the best part. This alien world, if we can confirm it, shouldn’t be there according to conventional planet-forming theory. Top image: TW Hydrae and…
io9
Elizabeth Howell — Universe Today