the earth seemed to be just a small bit of dust.It is only a small planet,and travels around the sun.The sun together with its planets,travels in the Milky Way,our galaxy.The Milky Way has about thirty billion stars like our sun,and is one of about a hundred million galaxies in the...
paradigm shift: a drastic change in the fundamental assumptions underlying a field; the impossible come true. Kuhnian resistance: defense of the current paradigm based on a belief that its problems can be fixed; doubt about the need for a whole new world. scientific revolution: the embrace of ...
When the world was a boundless blue ocean, when all life existed underwater and the land was no more than bare rock, the first gastropods emerged and crawled onto the beaches. This was more than 500 million years ago. Maybe the patient sea salt allowed these creatures to accumulate their b...
At the Mount Wilson Observatory, Hubble studied objects within our own galaxy using a with a mirror of one hundred and fifty-two centimetres in diameter. His discovery was the finding of a Cepheid variable star(造父变星) in the outer area of a nebula(星云),He that nebulae were galaxies th...
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