Tag Archives: Einstein

## How to slow down time in the lab

It is a known fact that due to space-time relativity the time flows slower when you move faster and that the time also slows down the moment you get closer to a center of gravity. This is called time dilation and it has been measures in GPS satellites or when people flew with the airplanes […]

## Why is time relative?

Einstein found out a hundred years ago that time and space are relative to the reference frames. That means that time flows a bit differently for someone in a plane than for someone standing still in his house. You get to see this at high speeds comparable to the speed of light, called relativistic speeds. […]

## The many formulas of gravity: each one tells something about it

Gravity is the force that keeps you glued to Earth. Except it is not a force as it is a space-time distortion generated by the presence of mass. But we will still be able to use formulas for it and still call it a force. There are three formulas for force: – F = m […]

## Gravity is NOT a force

But we have formulas that are checked and double-checked? How could it not be a force? Gravity is not a force, it is a space-time distortion caused by the presence of mass. In other words, if you put two masses in relative vicinity there won’t be a force that attracts each one to the other […]

## SciShow Space: what is gravitational lensing

Caitlin Hoffmeister, from SciShow Space, explains us what gravitational lensing is. Gravitational lensing is a process through which light gets bent in its path if it goes past a massive object like a star or like a galaxy. An object behind the star of galaxy might be seen even though you do not have direct […]

## E=mc ² is not the complete equation

Man, you got to love Minute Physics. Being too lazy and accepting many formulae like they were laws, when they are only a part of the whole, leads us to ignorance. Minute Physics explainws why E=mc ² is only a partof Einstens equation. Awesome. The full equation is E ²=(mc ²) ²+(pc) ². For an […]

## How Relativity and GPS make love to bring us the biggest clock ever [video]

We take for granted what it should be considered the magic of nowadays life: special and general relativity work to give us better GPS locations. You heard it. In order to track the exact position of an object you need to receive the signals from four of those 30 GPS satellites and then you will […]