So why did the IAU adopt a fixed standard for the astronomical unit? In the actual 2012 resolution, the possible drift due to the Sun’s mass loss is listed as one reason, but the main reason was the need for self consistent units in the framework of general relativity.
Double Pulsar Confirms Relativity
A system known as J0737-3039 confirms general relativity to within 0.04%.
The Optical Trifecta
To prove Einstein’s theory of special relativity, three different experiments had to be performed.
Relativity Wins Again
One of the great things about science is how we keep testing our assumptions. Even when a phenomenon has been rigorously tested, we still push the limits of observation. Take, for example, some recent research on the speed of light.
Do Black Holes Really Exist?
There are some who would argue black holes haven’t yet been proven. In a way, they have a point.
Does the Aether Exist? Hint: No
An interesting aspect of science history is that you can see how theoretical ideas rise and fall based upon the evidence. Models are proposed, experiments are made disproving them, and then the hammer falls. One such idea is that of the luminiferous Aether.
The Strangest Theory We Know Is True
After 99 years, Einstein’s greatest scientific achievement is undefeated.
Run Silent, Run Deep
The pulsar J1906+0746 has gone silent, and that’s good news for general relativity.
The Emperor’s New Clothes
Often when talking about gravity and general relativity the “fabric of spacetime” will be mentioned. This fabric is often visualized as a kind of rubbery sheet that can be bent and stretched by the presence of masses. We use this kind of imagery so often that one might imagine that’s actually what spacetime is. But if spacetime is a fabric, it is the same type of fabric used to make the Emperor’s new clothes.