I love this quote. Einstein knew that space is not no thing.
"One explanation for dark
energy is that it is a property of space. Albert Einstein was the first person
to realize that empty space is not nothing. Space has amazing properties, many
of which are just beginning to be understood. The first property that Einstein
discovered is that it is possible for more space to come into existence. Then
one version of Einstein's gravity theory, the version that contains a cosmological
constant, makes a second prediction: "empty space" can possess its own
energy. Because this energy is a property of space itself, it would not be
diluted as space expands. As more space comes into existence, more of this
energy-of-space would appear. As a result, this form of energy would cause the
Universe to expand faster and faster. Unfortunately, no one understands why the
cosmological constant should even be there, much less why it would have exactly
the right value to cause the observed acceleration of the Universe."
