relativity

Category archives for relativity

“One feels that the past stays the way you left it, whereas the present is in constant movement; it’s unstable all around you.” –Tom Stoppard You might best know Einstein for E=mc^2, but I would argue that the far greater contribution was the development of relativity. Think about the following: if you strike the upper…

“Oh leave the Wise our measures to collate. One thing at least is certain, light has weight. One thing is certain and the rest debate. Light rays, when near the Sun, do not go straight.” –Arthur Eddington While we know full well today that Newtonian gravity is just an approximation to a more correct theory…

It’s one of the cardinal laws of physics and the underlying principle of Einstein’s relativity itself: the fact that there’s a universal speed limit to the motion of anything through space and time, the speed of light, or c. Light itself will always move at this speed (as well as certain other phenomena, like the force…

“Nobody ever did, or ever will, escape the consequences of his choices.” –Alfred A. Montapert You might not think of falling into a black hole as a choice, but in the case of this week’s Ask Ethan, someone is choosing to explore exactly that! Imagine, if you will, taking a solid object that’s completely outside of an…

“If everything seems under control, you’re not going fast enough.” -Mario Andretti One of the toughest things to wrap your mind around in the natural world is the idea of special relativity: the faster you move, the closer you get to the speed of light, the more difficult it becomes to increase your speed at…

Imagine that you’ve got that absolutely weightless feeling, the kind you get when you lose your balance and hurtle towards the ground. Are you on a roller coaster? Did you fall out of an airplane? Or are you in an accelerating elevator? According to Einstein’s Equivalence Principle, there’s really no way for you to tell,…

Photonic Booms (Synopsis)

Imagine the surface of the Moon, so distant, and an infinitely precise and powerful laser pointer. With a flick of your wrist, you can send the dot that you see flying across the Moon’s surface as quickly as you can manage. Without too much difficulty, in fact, you’ll find yourself breaking the speed of light!…

“It followed from the special theory of relativity that mass and energy are both but different manifestations of the same thing — a somewhat unfamiliar conception for the average mind.” –Albert Einstein On the one hand, we have matter — things with mass — in the Universe, ranging all the way from planets, stars and galaxies on…

“We like to admit to only that which already glows, although it is nobler to support brightness before it glows, not afterwards.” –Dejan Stojanovic When we look back to greater and greater distances in the Universe, we’re looking back to earlier and earlier times as well. At some point, we can see far enough back…

“Henceforth space by itself, and time by itself, are doomed to fade away into mere shadows, and only a kind of union of the two will preserve an independent reality.” –Hermann Minkowski When you think of waves, chances are you think of some type of pressure wave moving through a medium, like sound or water…