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The universe is all of space and time [a] and their contents. [10] It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments.Since the early 20th century, the field of cosmology establishes that space and time emerged ...

The thin disk of our galaxy began to form when the universe was about 5 billion years old or 9 ± 2 Gya. [15] The Solar System formed at about 9.2 billion years (4.6 Gya), [5]: 22.2.3 with the earliest evidence of life on Earth emerging by about 10 billion years (3.8 Gya).

As space expanded, the universe cooled and matter formed. Step 3: Too hot to shine Light chemical elements were created within the first three minutes of the universe's formation.

The universe's fundamental particles also formed. It was still so hot, though, that these particles hadn't yet assembled into many of the subatomic particles we have today, such as the proton.

For example, when our universe was less than 380,000 years old, the volume of the universe was about a million times smaller than it is today, and it had an average temperature of around 10,000 ...

Some 400,000 years later the first stars formed from the clumps of hydrogen and begin to light-up the Universe. Evidence for the Big Bang includes: All other galaxies are moving away from us.

After five minutes, most of today’s helium had formed, and the universe had expanded and cooled enough that further element formation stopped. At this point, though, the universe was still too hot for the atomic nuclei of these elements to catch electrons and form complete atoms. The cosmos was opaque because a vast number of electrons ...

Our universe began with an explosion of space itself - the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies. Galaxies collected into groups, clusters, and superclusters.

As the universe expanded and cooled down, a series of dramatic changes, called phase transitions (like the boiling or freezing of water), separated these forces. ... formed through nuclear fusion reactions, like those that power the Sun. Back when there were more high energy photons in the universe, any atomic nuclei that formed would have been ...

Explain the formation of the universe and how we observe it. Understand the origin of our Solar System. Describe how the objects in our Solar System are identified, explored, and characterized. Describe the types of bodies in our Solar System, their locations, and how they formed. Explain what influences the temperature of a planet’s surface.

Inflation projected infinitesimal quantum fluctuations in the young Universe into cosmic scales, leaving some patches with a little more or a little less matter. These variations became the scaffolding for the structure of the Universe. As the Universe expanded, the seething plasma of subatomic particles cooled to form hydrogen, the first atoms.

Therefore the Universe is opaque. But about 300 000 years later, the Universe has cooled enough (to some 3000°C) to allow protons to capture electrons, and form neutral hydrogen atoms (in a phenomenon called 'recombination' or 'decoupling'). The Universe is about 1000 times smaller than its present size.

In Egyptian cosmology, people believed that the universe emerged from the primordial waters of the creator god, Nun, and these waters formed an abyss with boundless potential and endless possibilities. The sun god, Atum, was credited with bringing structure and form to the cosmos through his creative prowess.

How did the creation of the universe lead to our existence? With the current fleet of Astrophysics missions, researchers are able to study the first stars and galaxies forming out of the darkness of the early universe with state-of-the-art technologies that act as powerful time machines, peering back over 13.5 billion years.

On April 27, 4977 B.C., the universe is created, according to German mathematician and astronomer Johannes Kepler, considered a founder of modern science.

The universe began 13.8 billion years ago, and in its early years, it looked completely different than it does now. For nearly 400,000 years, the entire cosmos was opaque, which means we have no direct observations of anything that happened during that time. Even after the universe became transparent, it was still a long time before the first stars and galaxies formed, leaving us with limited ...

How old is the universe, and how did it begin? Throughout history, countless myths and scientific theories have tried to explain the universe's origins. The most widely accepted explanation is the big bang theory. Learn about the explosion that started it all and how the universe grew from the size of an atom to encompass everything in existence today.

That inflationary phase stretched the universe flat, created quantum fluctuations that got stretched across the universe, and then that inflationary state came to an end. It gave rise to a hot ...

In the moments immediately after the Big Bang, vast clouds of hydrogen and helium condensed out of subatomic matter, forming an opaque plasma that filled the entire universe for 380,000 years. Eventually, the universe cooled down enough that this opaque soup of charged gases formed into atoms.

Most astronomers think that the Universe was formed during an event called the Big Bang - a giant explosion which occurred between 10 and 20 billion years ago (see our "How Old is the Universe" page for a longer discussion of the age of the Universe...)During the Big Bang, all of the space, time, matter, and energy in the Universe was created.