Respuestas
Respuesta:
talk about the origin of the universe but
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Respuesta:
The best known theory of the origin of the universe centers on a cosmic cataclysm unparalleled in history: the big bang. This theory arose from the observation of other galaxies speeding away from our own in all directions, as if they had been repelled by an ancient explosive force.
Before the big bang, according to scientists, the vastness of the observable universe, including all its matter and radiation, was compressed into a dense, hot mass only a few millimeters away. This nearly incomprehensible state is speculated to have existed only a fraction of the first second of time.
Proponents of the big bang suggest that some 10 to 20 billion years ago, a massive shock wave allowed all known energy and matter in the universe (including space and time) to arise from some unknown energy.
The theory holds that, in an instant (one trillionth of a second) after the big bang, the universe expanded with incomprehensible speed from its pebble-sized origin to astronomical scope. The expansion has apparently continued, but much more slowly, for the next few billion years.
Scientists cannot know exactly how the universe evolved after the big bang. Many believe that as time went on and matter cooled, more diverse types of atoms began to form, and that these eventually condensed into the stars and galaxies of our present universe.
Origins of the theory
A Belgian priest named George Lemaître first suggested the big bang theory in the 1920s, when he proposed that the universe started from a single primordial atom. This idea later gained momentum from Edwin Hubble's observations of galaxies speeding away from us in all directions, and from the discovery of cosmic microwave radiation by Arno Penzias and Robert Wilson.
The glow of the cosmic microwave background radiation, which can be found throughout the universe, is thought to be a tangible remnant of the light remnants of the big bang. The radiation is similar to that used to transmit television signals via antennas. But it is the oldest known radiation and may hold many secrets about the earliest moments of the universe.
The big bang theory leaves many important questions unanswered. One is the original cause of the big bang itself. Many answers have been proposed to address this fundamental question, but none have been tested; indeed, a proper test of them would be a formidable challenge.