Acceleration kicked in when the average energy density of the universe decreased below the energy density attributed to dark energy (aka. The discovery led to the widespread acceptance of the idea that our Universe is dominated by a mysterious force called dark energy, and altered the standard model of cosmology forever. ... twice as far away should be moving about twice as fast. The universe is getting bigger every second — but how fast? With enough matter, the expansion will slow or even become a contraction. Alan Guth suggested that it was gravity acting against repulsive gravity that provided the energy for the Big Bang. The expansion or contraction of the universe depends on its content and past history.

Back in 2011, three astronomers were awarded the Nobel Prize in Physics for their discovery that the Universe wasn't just expanding - it was expanding at an accelerating rate.. Up until about 4–5 billion years ago, the expansion was actually slowing down.

It is an intrinsic expansion whereby the scale of space itself changes.The universe does not expand "into" anything and does not require space to exist "outside" it. On the other hand, dark energy drives the universe towards increasing rates of expansion.

the cosmological constant.) Astronomers using NASA's Hubble Space Telescope say they have crossed an important threshold in revealing a discrepancy between the two key techniques for measuring the universe's expansion rate. How We Know the Universe Is Expanding, and Accelerating. Technically, neither space nor objects in space move. How Fast is the Universe Expanding?

... discovered that not only is the universe expanding, it's accelerating. The expansion of the universe is the increase in distance between any two given gravitationally unbound parts of the observable universe with time.


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