Universe

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Paul C. Williams - Hubble Perspective on the Universe
Hubble Perspective on the Universe
The Universe is defined as the summation of all particles and energy that exist and the space-time in which all events occur. Based on observations of the portion of the universe that is observable, physicists attempt to describe the whole of space-time, including all matter and energy and events which occur, as a single system corresponding to a mathematical model.

The scientific theory which describes the origin and evolution of the universe is Big Bang cosmology, which describes the expansion of space from an extremely hot and dense state of unknown characteristics. The universe underwent a rapid period of cosmic inflation that flattened out nearly all initial irregularities in the energy density; thereafter the universe expanded and became steadily cooler and less dense. Minor variations in the distribution of mass resulted in hierarchical segregation of the features that are found in the current universe; such as clusters and superclusters of galaxies. There are more than one hundred billion (1011) galaxies in the universe,[1] each containing hundreds of billions of stars, with each star containing about 1057 atoms of hydrogen.

  

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Paul C Williams Personal Web Site - Florida from outerspace
Florida from outerspace
 

 

Universe Today

Space and astronomy news

Universe Today

  • Herschel Finds Water Around a Carbon Star

    There’s something strange going on around the red giant star CW Leonis (a.k.a. IRC+10216). Deep within the star’s carbon-rich veil, astronomers have detected water vapor where no water should be. CW Leonis is similar in mass to the sun, but much older and much larger. It is the nearest red giant to the sun, and [...]

  • Step On The Scales: Weighing Up Planet Earth…

    Scientists at the European Southern Observatory have identified the closest looking solar system to our own. They located a sun-like star more than 100 light years distant with as many as seven different planets, including one that might be the smallest ever found outside the solar system. (...)Read the rest of Step On The Scales: [...]

  • The Origin of Exoplanets

    We truly live in an amazing time for exoplanet research. It was only 18 years ago the first planet outside our solar system was discovered. Fifteen since the first confirmation of one around a main sequence star. Even more recently, direct images have begun to sprout up, as well as the first spectra of the [...]

  • Astronomy Without A Telescope – Space Towers

    Arthur C Clarke allegedly said that the space elevator would be built fifty years after people stopped laughing. The first space tower though… well, that might need a hundred years. The idea of raising a structure from the ground up to 100 kilometers in height seems more than a bit implausible by today's engineering standards, [...]

  • The Black Hole/Globular Cluster Correlation

    Often in astronomy, one observable property traces another property which may be more difficult to observe directly; X-ray activity on stars can be used to trace turbulent heating of the photosphere. CO is used to trace cold H2. Sometimes these correlations make sense. Activities in stars produce the X-ray emissions. Other times, the tracer seems [...]

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