Einstein;s biggest blunder (as he puts it himself) is the main priority of Astronomy today. Save for exo-planets, it is this enigmatic idea of the energy that;s stretching the universe thin and into nothingness. Why such a fuss on such a thing?
Nothing maybe.except that it constitutes 70 percent or more of what we don't see in the Universe,. But why is that? When Einstein first formulated the General Theory of Relativity, he first assumed that the universe is stable in itself. It doesn't grow nor shrink. It is just right. However when Lemaitre pointed out that the mathematics of Einstein's formula shows it is expanding, he immediately reformulated it by adding another term in the original formula (Rmn - gmn/2 R = 8pi G Tmn/c4) - Ricci Tensor-half of Metric Tensor x Scalar Curvature = Stress-Energy-Momentum Tensor See this video.
By adding another Term called the Cosmological Constant, the function then causes the entire expression to balance out again. Forcing the entire expression to become stable. Later Edwin Hubble experimentally verified that the universe is constant, which led to Einstein's dropping the Cosmological Constant once more and called it his greatest blunder. However, latest measurements of Universal expansion show that the Universe is expanding faster than even Edwin Hubble imagined. Now Scientists have reinserted the Cosmological Constant once more but this time its sign is opposite. They then attribute this rapid acceleration as the Dark Energy and the Cosmological Constant now stands as the mathematical representation of th Dark Energy.
This article then tells us what could be Einstein's greatest insight rather than blunder.
