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2021-05-14

How does the Big Bang theory describe the universe when it began?

How does the Big Bang theory describe the universe when it began?

The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

What are the 3 main pieces of evidence for the Big Bang?

Three main pieces of evidence for the Big Bang theory are the red-shift of light, cosmic background radiation and types of elements.

What did the universe look like right after the Big Bang?

In the first moments after the Big Bang, the universe was extremely hot and dense. As the universe cooled, conditions became just right to give rise to the building blocks of matter – the quarks and electrons of which we are all made. As the universe continued to expand and cool, things began to happen more slowly.

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What characterized the universe during the first 400000 years?

For the first 400,000 years or so after the big bang, the Universe was filled with elementary particles, which absorbed & scattered photons, & was therefore opaque.

Do we live in a flat universe?

The exact shape is still a matter of debate in physical cosmology, but experimental data from various independent sources (WMAP, BOOMERanG, and Planck for example) confirm that the universe is flat with only a 0.4% margin of error.

How can the universe be flat and accelerating?

A universe with too much density collapses in on itself, a critical density universe stays static, while a universe with not enough density keeps expanding at a steady (coasting) rate. However, today’s cosmology puts emphasis upon the cosmological constant, which gives an accelerating expansion.

What are 3 possible fates of the universe?

There’s three possible fates for the universe, one is called the Big Crunch, where gravity takes over and begins to pull the cosmos back, compressing to one point. Another extreme is the Big Rip, where the expansion of the universe just gets faster until galaxies, stars, planets, atoms and space itself is ripped apart.

What are the 4 dimensions of the universe?

Our Universe as we know it has four dimensions: the three dimensions of space (up and down, left and right, back and forth), and one dimension of time that keeps us all ticking along.

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How thick is the flat universe?

Rest is unknown. Our universe is currently as large as having a radius of 18000 billion light years. 93 billion light years is just the observable universe. The maximum distance from which light has fell upon us.

Is our universe open or closed?

This is known as an open universe. The shape of the universe depends on its density. If the density is more than the critical density, the universe is closed and curves like a sphere; if less, it will curve like a saddle.

How many dimensions do we live in?

In everyday life, we inhabit a space of three dimensions – a vast ‘cupboard’ with height, width and depth, well known for centuries. Less obviously, we can consider time as an additional, fourth dimension, as Einstein famously revealed.

Where is the end of space?

No, they don’t believe there’s an end to space. However, we can only see a certain volume of all that’s out there. Since the universe is 13.8 billion years old, light from a galaxy more than 13.8 billion light-years away hasn’t had time to reach us yet, so we have no way of knowing such a galaxy exists.

What is the biggest object in the universe?

The largest known ‘object’ in the Universe is the Hercules-Corona Borealis Great Wall. This is a ‘galactic filament’, a vast cluster of galaxies bound together by gravity, and it’s estimated to be about 10 billion light-years across!

What is the oldest thing in the universe?

With a redshift of z = 8.2, at the time of observation, the burst was the most distant known object of any kind with a spectroscopic redshift. GRB 090423 was also the oldest known object in the Universe, apart from the methuselah star. As the light from the burst took approximately 13 billion years to reach Earth.

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Can the universe be older than we think?

Since around 1997–2003, the problem is believed to have been solved by most cosmologists: modern cosmological measurements lead to a precise estimate of the age of the universe (i.e. time since the Big Bang) of 13.8 billion years, and recent age estimates for the oldest objects are either younger than this, or …

Is there anything older than the universe?

HD 140283 (or the Methuselah star) is a metal-poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the boundary with Ophiuchus in the Milky Way Galaxy.

Why was Hubble’s age of the universe wrong?

For as it turned out, all the distances to spiral nebulae that Hubble had calculated were too small by half. This age estimate for the universe, Hubble acknowledged, was clearly less than the age of the Earth, as determined by geologists who measured the radioactivity in rocks.

How long will the universe last?

200 billion years

Are there other universes?

There is not one universe—there is a multiverse. In Scientific American articles and books such as Brian Greene’s The Hidden Reality, leading scientists have spoken of a super-Copernican revolution.

What is the dark era?

The Dark Era is defined as “n > 101”. By this era, with only very diffuse matter remaining, activity in the universe will have tailed off dramatically, with very low energy levels and very large time scales.