Sixty Symbols

So I’ve run into these videos before, but never realized they were part of a masterful series. The University of Nottingham has created 60+ ~5 minute videos each devoted to a symbol used in physics and astronomy.

The Saturn and Jupiter videos were both great.

And a recent video all about Saturn’s most recently discovered (and very faint) ring. This is easily the best description I’ve heard of the ring and how it likely formed:

Check them out… they’re short, interesting, well made, and awesome.

Newton’s Birthday

Today’s Issac Newton’s birthday, the man who discovered the simple equations that predict the forces of gravity.

Newton's Law of Gravity

This simple equation is at the heart of Universe Sandbox. It’s what makes it all work.

And while his beautiful equation doesn’t work when you get really small or really big, it’s “adequate over an enormous range of masses of objects from about 10−23 to 1030 kg.” source

It’s amazing how something so simple can explain so much.

Happy Birthday Issac.


For comparison: Earth’s mass about 6 × 1024 and the Sun’s mass is about 2 ×1030 .

More about Newton

More about Gravity’s_law_of_universal_gravitation