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The Sun is a star around which Earth and the other planets revolve, and by extension every visible star in the sky is a sun in its own right.Some stars are intrinsically brighter than the Sun; others, fainter.The cosmic microwave background is believed to be a ghostly remnant of the fierce light of the primeval fireball reduced by cosmic expansion to a shadow of its former splendour but still pervading every corner of the known universe.
Interpreted in the simplest fashion, the Hubble law implies that 13.8 billion years ago all of the matter in the universe was closely packed together in an incredibly dense state and that everything then exploded in a “big bang,” the signature of the explosion being written eventually in the galaxies of stars that formed out of the expanding debris of matter.
Strong scientific support for this interpretation of a big bang origin of the universe comes from the detection by radio telescopes of a steady and uniform background of microwave radiation.
Therefore, as the universe expands, the density of its energy and matter must become progressively thinner.
At left is a two-dimensional representation of the universe as it appears now, with galaxies occupying a typical section of space.
If one looks up on a clear night, one will see that the sky is full of stars.
During the summer months in the Northern Hemisphere, a faint band of light stretches from horizon to horizon, a swath of pale white cutting across a background of deepest black.
At right, billions of years later the same amount of matter will fill a larger volume of space.
The simple (and most common) interpretation of the Hubble law as a recession of the galaxies over time through space, however, contains a misleading notion.
Elliptical galaxies have roundish shapes rather than the flattened distributions that characterize spiral galaxies, and they tend to occur in rich clusters (those containing thousands of members) rather than in the loose groups favoured by spirals.Tags: Adult Dating, affair dating, sex dating