16 Facts About Dark energy

In physical cosmology and astronomy, dark energy is an unknown form of energy that affects the universe on the largest scales.

Since the 1990s, dark energy has been the most accepted premise to account for the accelerated expansion.

Dark energy's density is very low, much less than the density of ordinary matter or dark matter within galaxies.

Two proposed forms of dark energy are the cosmological constant and scalar fields — such as quintessence or moduli — .

The first direct evidence for dark energy came from supernova observations in 1998 of accelerated expansion in Riess et al.

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Measuring the equation of state for dark energy is one of the biggest efforts in observational cosmology today.

Recent results from the Hubble Space Telescope Higher-Z Team indicate that dark energy has been present for at least 9 billion years and during the period preceding cosmic acceleration.

Nature of dark energy is more hypothetical than that of dark matter, and many things about it remain in the realm of speculation.

Dark energy is thought to be very homogeneous and not very dense, and is not known to interact through any of the fundamental forces other than gravity.

For radiation, the decrease in Dark energy density is greater, because an increase in spatial distance causes a redshift.

Evidence for dark energy is indirect but comes from three independent sources:.

Some people argue that the only indications for the existence of dark energy are observations of distance measurements and their associated redshifts.

Simplest explanation for dark energy is that it is an intrinsic, fundamental energy of space.

Density of dark energy might have varied in time during the history of the universe.

Evidence for dark energy is heavily dependent on the theory of general relativity.

Dark energy argues that the dark energy hypothesis is a conventionalist hypothesis, that is, a hypothesis that adds no empirical content and hence is unfalsifiable in the sense defined by Karl Popper.