Univers ultra condensed Pc#

The ΛCDM model is the most widely accepted model of the universe. This unseen matter is known as dark matter ( dark means that there is a wide range of strong indirect evidence that it exists, but we have not yet detected it directly). Giant clouds of hydrogen and helium were gradually drawn to the places where dark matter was most dense, forming the first galaxies, stars, and everything else seen today.įrom studying the movement of galaxies, it has been discovered that the universe contains much more matter than is accounted for by visible objects stars, galaxies, nebulas and interstellar gas. Dark matter gradually gathered, forming a foam-like structure of filaments and voids under the influence of gravity. After an initial accelerated expansion called the inflationary epoch at around 10 −32 seconds, and the separation of the four known fundamental forces, the universe gradually cooled and continued to expand, allowing the first subatomic particles and simple atoms to form. Īccording to the Big Bang theory, the energy and matter initially present have become less dense as the universe expanded. Discoveries in the early 20th century have suggested that the universe had a beginning and that space has been expanding since then at an increasing rate. At smaller scales, galaxies are distributed in clusters and superclusters which form immense filaments and voids in space, creating a vast foam-like structure. At the largest scale, galaxies are distributed uniformly and the same in all directions, meaning that the universe has neither an edge nor a center. Many of the stars in a galaxy have planets. In developing the law of universal gravitation, Isaac Newton built upon Copernicus's work as well as Johannes Kepler's laws of planetary motion and observations by Tycho Brahe.įurther observational improvements led to the realization that the Sun is one of a few hundred billion stars in the Milky Way, which is one of a few hundred billion galaxies in the observable universe.

Over the centuries, more precise astronomical observations led Nicolaus Copernicus to develop the heliocentric model with the Sun at the center of the Solar System. Some of the earliest cosmological models of the universe were developed by ancient Greek and Indian philosophers and were geocentric, placing Earth at the center. While the spatial size of the entire universe is unknown, it is possible to measure the size of the observable universe, which is approximately 93 billion light-years in diameter at the present day. According to this theory, space and time emerged together 13.787 ☐.020 billion years ago, and the universe has been expanding ever since the Big Bang.

The Big Bang theory is the prevailing cosmological description of the development of the universe. The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.

Univers ultra condensed Pc#

Observable universe: 8.8 ×10 26 m (28.5 G pc or 93 G ly) The Hubble Ultra-Deep Field image shows some of the most remote galaxies visible to present technology (diagonal is ~1/10 apparent Moon diameter)