In this case, the quasar is being lensed by a closer unnamed galaxy, which is visible as a blue dot in the ... it is known as ...
The other is Albert Einstein. If pressed ... For example, in 1910, Einstein answers a basic question: "Why is the sky blue?" His paper on the phenomenon called critical opalescence solves the ...
It is hard to imagine a time when Albert Einstein's name was not recognised around the world. But even after he finished his theory of relativity in 1915, he was nearly unknown outside Germany ...