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Is Dark Energy Darkening Our Universe?

Donald Wikramathanthri - Vidya E News Article Contest - 2023 (Winning Articles)

Today we all agree that our universe was created in a big bang. This is known as the big bang theory. Astronomers in the 20th century discovered that the universe continued to expand. Dark energy is what causes our universe’s expansion rate to accelerate over time instead of slowing down. The name given to the supernatural force. That’s pretty much what you’d expect from a universe that started with a big bang. Scientists thought that the expansion of the universe would go on forever, or that eventually – if the universe had enough mass and the resulting self-gravity – there might be a great contraction. In early 21st century cosmology, the idea evolved further. The universe is billions of years old. It seems to be expanding faster today than it did a few years ago. What could cause the rate of expansion to increase? Astronomers now sometimes talk about a mystical repulsive force as a way to understand it. Until the late 1990s, most cosmologists believed that the universe did not have enough mass to cause a major contraction. In particular, data from the 2dF Galaxy Redshift Survey and the Sloan Digital Sky Survey suggest that the universe is pulled back by its own mass and gravity. Even if tried, it confirms that the universe is expanding forever, albeit always at a slower rate.

In 1998, a survey of Type 1A supernovae gave the first indication of something revolutionary to be discovered. These massive bursts of dying giant stars are extremely useful to astronomers because they always output the same amount of light, which is used for calculations of distances in the universe.

Because it can be used as a standard. This can be explained with a very simple example, by considering that the starlings flying at night all shine with the same brightness and by measuring how bright they are from where you are, you can calculate their distance.

The survey was conducted by an international team of astronomers, including Americans Adam Rises and Saul Perlmutter and Australia’s Brian Schmidt, using eight telescopes around the world to calculate the expansion rate of the universe, known as the Hubble constant. Type 1A uses the distance of supernovae (which, of course, is technically not a constant, as the universe’s expansion rate varies with time).

The results of the survey were surprising. Distant supernovae that exploded when the universe was only 2/3 of its current age were far farther away than they should have been. The implication was that the universe was expanding much faster than it should have been if current ideas were correct.

When these results were revealed, there was much skepticism in the astronomical community, and the observations were quickly investigated by other groups and alternative methods. It revealed at the turn of the millennium that the expansion of the universe was not slowing down as previously believed. Otherwise, the expansion of the universe is actually happening at a faster rate.

Even more surprisingly, until seven or eight billion years after the Big Bang, as one would expect, the rate of cosmic expansion was slowing down, but then, for completely unknown reasons, gravity overcame the brakes on expansion in a mysterious “antigravity” force. Under dominance, cosmic expansion stops decelerating and accelerates.

To add to the mystery, the properties of this strange dark energy were also found to match Einstein’s Universal Constant. In some cases, this was called the fudge factor, and Einstein later called it the biggest professional mistake of his life.

Dark energy is one of the great unsolved mysteries of cosmology. It is now thought that 68% of everything in the universe is this dark energy, 5% of all the matter we can actually see, and the rest, another cosmic mystery, dark matter.

Dark energy acts like Einstein’s anti-gravity force, but its nature and origin are still uncertain. Dark energy is the expansion rate of the universe at a certain time billions of years after the Big Bang

One of the biggest mysteries is why it started to dominate opinion. If it exists now, why hasn’t it been there all along? It is an unsolved problem.

Cosmologists still have no idea whether dark energy is accelerating the universe’s expansion forever. Thus, in the future, this acceleration is believed to literally ‘rip’ all the material in the universe, the force currently holding the universe together, and it is a ‘big-rip’ (opposite of big-bang). The meaning of the idea) is a nightmare!

There are several current and future space missions and ground-based surveys investigating the nature of dark energy, including NASA’s orbiting Wide-Field Infrared Survey Telescope (WFIRST) and the International Dark Energy Survey in Chile.

It is hoped that soon we will have a greater understanding of this mysterious force that has such an influence on the future of the universe. But to get that understanding, we need to get a more complete understanding of the history of the universe. However, exploring 13.7 billion years of archeology is extremely difficult and It is a time-consuming process, and since many of the ancient layers of that history have disappeared or are unclear, we cannot expect a sudden revelation about it in recent times.


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