Calculating the energy contained in Angular Momentum (think: anything in orbit) ... for the observable universe. In that other thread 'why does the universe exist', there is some minor mention of the ...

I love using seemingly random data to figure out stuff I wouldn't otherwise know. You can do this with all kinds of things, but in this example, I use video that I recorded from an airplane to figure ...

In my recent post about calculating the speed of light, I mentioned Ole Roemer's calculation in 1676. The basic idea uses the orbit of one of Jupiter's moons. The orbital period is constant, but there ...