Dark energy is a mysterious energy source that causes the universe to expand at an accelerating rate. It’s described as a repulsive force that pushes space outward. 

Dark energy is the dominant component of the universe, contributing 68% of the total energy. It’s very low density, but it dominates the universe’s mass–energy content because it’s uniform across space. 

Some say the accelerated expansion of the universe began about 5 billion years ago. Dark energy causes distant galaxies to move away from us faster and faster

What exactly is dark energy? Right now, dark energy is just the name that astronomers gave to the mysterious “something” that is causing the universe to expand at an accelerated rate. Dark energy has been described by some as having the effect of a negative pressure that is pushing space outward.

Dark energy is a hypothetical form of energy that astronomers believe is causing the universe to expand at an accelerated rate. It’s thought to be the dominant component of the universe, contributing 68% of its total energy. 

Dark energy is a negative, repulsive pressure that behaves like the opposite of gravity. It fills the universe and stretches the fabric of spacetime, driving cosmic objects apart at an increasingly rapid rate. 

Dark energy was discovered in 1998 by two international teams of astronomers. The first observational evidence for its existence came from measurements of supernovae. 

The accelerated expansion of the universe is thought to have begun roughly 5 billion years ago.

Some scientists think that dark energy is a fundamental, ever-present background energy in space known as vacuum energy, which could be equal to the cosmological constant, a mathematical term in the equations of Einstein’s theory of general relativity

Dark energy accelerates the expansion of the universe because its energy density doesn’t change as the universe expands. As more space is created, more dark energy appears, causing the expansion to accelerate. 

Dark energy and gravity have been in a cosmic tug of war since the early expansion of the universe. Gravity pulls galaxies together, while dark energy pushes them apart. Whether the universe expands or contracts depends on which force is stronger

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

According to NASA, this energy is a property of space itself, so it won’t be diluted as space expands. This means that as more space comes into existence, more of this energy-of-space would appear. This form of energy would cause the universe to expand faster and faster. 

Einstein’s gravity theory predicts that “empty space” can have its own energy. This energy would not be diluted as space expands, because it is a property of space itself. 

Dark energy is the name that astronomers gave to the mysterious “something” that is causing the universe to expand at an accelerated rate. Some have described dark energy as having the effect of a negative pressure that is pushing space outward. 

The discovery of dark energy was recognized by the Nobel Prize in Physics in 2011.

According to Einstein, “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, thereby causing accelerated expansion.

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