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The Big Bang Theory postulates that the portion of the Universe we can see today was only a few millimetres across more than 13 billion years ago. The Universe has since expanded from this hot, dense state into the vast and much cooler cosmos we currently inhabit.


  • Theory of the Interaction of Swift Ions with Matter Part 2.
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  • A Rough Timeline of the Universe.

As the Universe expands, the gas and radiation within it cool. The Universe should thus be filled with radiation that is literally left over from the Big Bang, what is called Cosmic Microwave Background Radiation. Since the radiation we see today has travelled a great distance, it can give us insights into the expansion of the Universe and its origins.

In , NASA published a map of the infant Universe as it would have looked more than 13 billion years ago, based on satellite images of cosmic microwave background radiation taken by the Wilkinson Microwave Anisotropy Probe in Over the past three years, the Planck-Surveyor satellite has managed to produce a far more accurate map of the infant Universe.

Once the Universe had cooled sufficiently, some , years after the Big Bang, the Universe became transparent, allowing light to travel freely through space for the first time. The Planck-Surveyor satellite has captured an image of this light coming from all directions. Each photon records the temperature of the place where it originated more than 13 billion years ago. Fundamental particle: A particle, such as the quark or electron, which scientists believe cannot be subdivided further.

The Origin of the Universe | Scholastic

Galaxy: An enormous system containing billions of stars, plus vast amounts of dust and gas; the Milky Way, for example. Hubble constant: The ratio of the speed with which galaxies are moving away receding from an observer to their distance from us, due to the expansion of the universe. Neutrino: A fundamental particle that has no electric charge and very little mass. It can pass through whole planets or stars without interacting with other particles.

Neutron: One of the baryons that make up atoms. Neutrons have no electrical charge and are made of one up quark and two down quarks. Neutron star: The collapsed core of a massive star that remains after a supernova explosion. The remaining matter is compressed so tightly that negatively charged electrons and positively charged protons are forced together.

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Proton: A baryon found in the nucleus of every atom. Made of two up quarks and one down quark, a proton has a positive charge. Quark: The family of fundamental particles that combine to make baryons. Quarks come in six flavours: up, down, charm, strange, top, bottom. Quasar: The bright centre of an active galaxy, probably fuelled by an enormous black hole that swallows matter.

Red-shift: An increase in the wavelength of light or sound. In the case of distant galaxies, this increase is caused by the expansion of the universe. Solar system: The Sun and all the celestial bodies that orbit it, including the planets and their moons, asteroids, comets and so on. Star: A large mass of hot gas held together by its own gravity and fueled by nuclear reactions.

The Origin of the Universe

String theory: Theory of the universe, which says that the fundamental ingredients of nature are but tiny one-dimensional filaments called strings. White dwarf: The remnant core of a star that has exhausted its nuclear fuel and settled into a solid ball of matter. Cheat Sheet. A Rough Timeline of the Universe Probing back to the origin of the universe involves a lot of estimation and guesswork.

Time and space are created. The Origins of the Universe Glossary Understanding the technical jargon that makes up the science behind understanding the origins of the universe is made a little simpler with this helpful glossary. Antimatter: Material composed entirely of antiparticles.

Greek and Roman Mythology Names The predominant mythologies handed down through the ages are those of the Greeks and Roman Key Dates in Irish History Ireland has had a vast history of vast invasions, revolutions, wars and conflicts. Take a World History For Dummies Cheat Sheet Trying to grasp the history of the world may seem more than a bit daunting — all tho Mythology For Dummies Cheat Sheet Many cultures create a mythology to help explain the workings of the world. Western civili