state-theory-and-oscillating-theory.pptx

Lesson 1.2 Steady-State Theory and Oscillating Universe Theory Try it! Warm-Up ass? M Volum We igh t?e De ?n si ty?  Learn about It! The Steady-State Theory The steady-state theor...

Lesson 1.2 Steady-State Theory and Oscillating Universe Theory Try it! Warm-Up ass? M Volum We igh t?e De ?n si ty?  Learn about It! The Steady-State Theory The steady-state theory is another view that proposes that the universe has always been expanding. As the universe expands, new stars and galaxies are formed at the same rate that old ones become unobservable due to distance and recession velocity.  Learn about It! Despite the continuous expansion, the average density of the universe remains the same; hence, the name steady state. In the steady-state theory, matter is constantly created as the universe expands.  Learn about It! The universe, according to the Steady-State Theory: has no beginning and has no end. has always been here and will always be present. always looks the same in any time and space. creates new matter as it continuously expands.  Learn about It! Proponents of the Steady-State Theory Hermann Bondi, Thomas Gold, and Fred Hoyle proposed the steady state theory in 1948.  Learn about It! Oscillating Universe Theory Oscillating universe theory, also known as pulsating theory, proposes that the universe is expanding and will contract once all the energy after the big bang has been used up. Then, it will expand again once it approaches the point of singularity.  Learn about It! The Big Crunch The oscillating universe is a combination of big crunch and big bang. Big crunch occurs when the universe expands and Once the universe reverses eventually reverses, then and attains the point of collapses causing the singularity, another universe will be born.  Learn about It! The Big Bang Singularity results in a big bang and the birth of a new universe. Once the universe reverses and attains the point of singularity, another universe will be born.  Learn about It! Proponent of the Oscillating Universe Theory Richard Tolman, a Caltech professor, proposed it. Tolman called the birth of another universe as the big bounce. Richard Tolman  Learn about It! Drawbacks of the Oscillating Universe Theory The suggestion that the universe would collapse on its own after it reaches its full expansion violates some current laws of physics, such as the postulated existence of dark energy. The currently postulated end of the universe is by big freeze or heat death.  Key Points The steady-state theory suggests that the universe has always been here and will always be present. It was proposed by Hermann Bondi, Thomas Gold, and Fred Hoyle in 1948.  Key Points The oscillating universe theory discusses that the universe is expanding and will contract once all the energy after the big bang has been used up, only to expand again once it approaches the point of singularity. Richard Tolman is the proponent of the oscillating universe theory.