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Major Features of the universe
Transcript of Major Features of the universe
(the Galaxy) the galaxy of which the solar system is a part; the Milky Way. any of a vast number of celestial objects that are visible in the clear night sky as points of light
a hot gaseous mass, such as the sun, that radiates energy, esp as light and infrared radiation, usually derived from thermonuclear reactions in the interior, and in some cases as ultraviolet, radio waves, and X-rays. The surface temperature can range from about 2100 to 40 000°C A nebula is a massive cloud of gas and dust in outer space. A nebula is sometimes the birthplace of stars, such as the Orion Nebula where new stars — a youthful million years old –- are still forming. The explosion of an extremely small, hot, and dense body of matter that, according to some cosmological theories, gave rise to the universe between 12 and 20 billion years ago. The system containing the sun and the bodies held in its gravitational field, including the planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune), the dwarf planets (Eris, Pluto, and Ceres), the asteroids, and comets The convergence of all matter, energy, and space into a single, minute point. This convergence is hypothesized to be the final event in the universe in some cosmological theories A cosmological theory stating that the universe has always expanded at a uniform rate with no beginning or end, that it will continue to expand and have constant density, and that the distribution of old and new objects in the universe is basically even. The theory has been largely abandoned in favor of the big bang theory,