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It hasn't.
The have become much more powerful.
they ave oxygen tanks
The "big bang" theory is still relatively new. British astronomer Sir Fred Hoyle came up with the term "big bang" as a derogatory term in the 1950's, because Hoyle was a life-long believer in the "steady state" theory of the universe.
i dont know so google it
The Theory of Continental Drift!
By now, this should not still be a theory, it should be common knowledge.
Charles Darwin Theory of natural selection
Scientists use it to describe how organisms have changed over time.
Charles Darwin changed history with his theory of evolution. His theory of evolution suggested that species undergo small changes over time.
it shows how the earth used to be and how it spread and changed over time
it shows how the earth used to be and how it spread and changed over time
how the anemometer changed over time
how the anemometer changed over time
yes. if a new scientist comes along that is more educated a theory can change. over time scientists learn more and more about topics and they can be updated when new information is discovered.
The laws of physics have not changed over time. Our understanding of them has changed over time.
this can never change, light travels at a constant speed, a light year is the distance light travels in one year.