A Very Good Resource on Dark Energy

In summary, dark energy is a theoretical form of energy that makes up about 70% of the universe and is responsible for the accelerating expansion of the universe. It is distinct from dark matter, which is a type of matter that makes up about 27% of the universe's mass. The existence of dark energy is inferred from observations of the accelerating expansion of the universe, and it is believed to be the dominant force in the universe that influences the formation and evolution of structures. Currently, dark energy cannot be observed or harnessed, and further research is being conducted to gain a better understanding of this elusive concept.
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http://www.annualreviews.org/doi/pdf/10.1146/annurev.astro.46.060407.145243

Dark Energy and the Accelerating Universe
 
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The arXiv document is free. Annual Review asks for payment.
 
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What is dark energy?

Dark energy is a theoretical form of energy that is believed to make up about 70% of the universe. It is thought to be responsible for the accelerating expansion of the universe.

How is dark energy different from dark matter?

Dark energy and dark matter are often confused, but they are two distinct concepts. While dark energy is thought to be a form of energy that affects the expansion of the universe, dark matter is a type of matter that cannot be directly observed but is believed to make up about 27% of the universe's mass.

What evidence do we have for the existence of dark energy?

The existence of dark energy is inferred from observations of the accelerating expansion of the universe. This was first discovered in the late 1990s through observations of distant supernovae. Other evidence includes observations of the cosmic microwave background radiation and the large-scale distribution of galaxies.

How does dark energy affect the universe?

Dark energy is believed to be the dominant force in the universe, causing it to expand at an accelerating rate. This expansion influences the formation and evolution of galaxies and other structures in the universe.

Can dark energy ever be observed or harnessed?

At this time, dark energy cannot be observed or harnessed. It is a theoretical concept that is still not fully understood. Scientists are continuing to study and research dark energy in hopes of gaining a better understanding of this mysterious force.

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