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STEADY STATE THEORY
Transcript of STEADY STATE THEORY
The Steady State theory states that the universe has always been the same and will always be the same. It states that the universe never didn't exist and never won't exist. The theory states that although the universe is expanding, it always remains balanced. In order to balance the decrease in density caused by the expansion of the universe, new matter is created, with new galaxies replacing old galaxies.
PROPONENTS and HOW IT CAME ABOUT
COMPARISON of STEADY STATE AND BIG BANG
EVIDENCE AGAINST STEADTY STATE THEORY
How it eventually became discarded
The theory was first put forward in 1920 by Sir James Jeans but really got a boost when presnted again in revised form in 1948 by British scientists Sir Hermann Bondi and Thomas Gold.
It was further developed by Fred Hoyle to deal with problems that had arisen in connection with the alternative big-bang hypothesis.
The term '
' means a stable condition that does not change over time.
Perfect Cosmological Principle,
which states that the Universe is infinite in extent, infinitely old and, it is the same in all directions and at all times in the past and at all times in the future, is one of the major features of the Steady State Theory.
The Steady State theory was very popular in the 1950s. However, evidence against the theory began to emerge during the early 1960s. Firstly, observations taken with radio telescopes showed that there were more radio sources a long distance away from us than would be predicted by the theory. By a long distance, this means billions of light years.
Another piece of evidence which emerged to discredit the theory emerged in 1963, when a new class of astronomical objects called
was discovered. A quasar is what is thought to be a massive black hole powering a luminous galaxy core.
Is the Steady State theory a good theory?
In the words of Stephen Hawking, ‘the Steady State theory was what Karl Popper would call a good scientific theory: it made definite predictions, which could be tested by observation, and possibly falsified. Unfortunately for the theory, they were falsified.
However, for the reasons given above, by the early 1970s the steady state theory was no longer accepted by the vast majority of cosmologists. The Big Bang theory is now generally believed to explain the origin of the Universe.
Radio astronomers Arno Penzias and Robert Wilson scientists discovered the cosmic microwave (high frequency radio wave) background which is thought to be leftover radiation from the Big Bang.
He started from the observational fact that the universe is expanding. This immediately raised a question: If galaxies are continuously rushing away from each other, does that mean that space is becoming more and more empty? Hoyle answered with a no.