relativity

Category archives for relativity

“When I was in high school, I was certain that being an astronaut was my goal. It was a very important time — Sally Ride was making her first flight into space and she had a real impact on me. Those ‘firsts’ kind of stick in your head and really become inspirations for you.” Karen Nyberg,…

“If you are not completely confused by quantum mechanics, you do not understand it.” -John Wheeler Now that LIGO has detected gravitational waves directly, it’s time to examine all the different sources that they come from, and what they can teach us about the Universe. While accelerating masses in strong gravitational fields — black holes,…

“The fundamental choice is not whether humans will have faith, but rather what the objects of their faith will be, and how far and into what dimensions this faith will extend.” -Matt Emerson Writing in the Wall Street Journal, Matt Emerson asserts that science is faith-based, since scientists believe that the predictions of their theories…

“You asked me how to get out of the finite dimensions when I feel like it. I certainly don’t use logic when I do it. Logic’s the first thing you have to get rid of.” -J.D. Salinger Now that gravitational waves have been verified to exist, and the first black hole-black hole merger has been…

“If the imprint is really due to gravitational waves from the big bang, then this is the type of cosmological discovery that comes along perhaps once every fifty years.” -Kip Thorne Now that LIGO’s successfully detected it’s first gravitational waves — from two merging black holes — we know that we will find them in…

Can LIGO test Quantum Gravity? (Synopsis)

“There was a long history of speculation that in quantum gravity, unlike Einstein’s classical theory, it might be possible for the topology of spacetime to change.” -Edward Witten General relativity makes very specific prediction for what the curvature of space should be at the event horizon of a black hole, and for the consequences to…

“Einstein’s gravitational theory, which is said to be the greatest single achievement of theoretical physics, resulted in beautiful relations connecting gravitational phenomena with the geometry of space; this was an exciting idea.” -Richard Feynman When we look out into the Universe, we normally gain information about it by gathering light of various wavelengths. However, there…

“Science, however, gives me the feeling of steady progress: I am convinced that theoretical physics is actual philosophy. It has revolutionized fundamental concepts, e.g., about space and time (relativity), about causality (quantum theory), and about substance and matter (atomistics), and it has taught us new methods of thinking (complementarity) which are applicable far beyond physics.”…

“Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.” -Albert Einstein While it’s easy to look on Einstein’s general theory of relativity — which turns 100 today — as a revolutionary new way to interpret space and time, as well as their interplay with matter and energy,…

“Gravitational and electromagnetic interactions are long-range interactions, meaning they act on objects no matter how far they are separated from each other.” -Francois Englert Want a recipe for seeing as far into the distant Universe as you can? Because of how distance and brightness are inversely related, you need to make the most of every…