The doors she opened
Hubble measured the distance to a star which was so far, that the science community declared it to be of somewhere out of the Milky Way Galaxy; the andromeda galaxy.Henriatta indirectly hepled discovering a new galxy, and the expansion of the universe. Hubble noticed that the galaxies are moving apart and apart. This idea completely changed everyone's perception. Before this discovery, it was believed that the cosmos is constant. It has always been there and it never contracts or expands.
Assume a balloon with dots on it, you inflate the balloon and the dots move apart. This is an analogy.
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Dark matter, theory of relativity, dark energy, negative mass, end of the universe, The Big Bang, 'What is beyond the universe?' etc. If you love such things, Welcome to your home.'
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The ‘Hubble-Lemaître’ law
The 'Hubble-Lemaître' law is more useful for calculating distant galaxies. The law shows that the further the galaxy is from Earth, the faster it moves away from us - the consequence of the Universe expanding.
The galaxy's speed is measured by...
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