spatial expansion

How Einstein may have explained Dark Energy

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The following excerpt from NASA’s in its Astrophysics web site Dark Energy describes what we do and don’t know about Dark Energy. “More is unknown about it than is known. We know how much dark energy there is because we know how it affects the Universe’s expansion. Other than that, it is a complete mystery. … Read more

Dark Energy in four *spatial* dimensions

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In 1998 the Hubble Space Telescope when observing distant supernovae discovered that the Universe was expanding more slowly in the past than it is today. In other words the Universe has not been slowing due to gravity, as everyone thought, it has been accelerating.  No one expected this, no one knew how to explain it. … Read more