- #1
albroun
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Dark matter exerting a gravitational effect on earth??
I have a puzzle about so-called dark matter. If it is supposed to supply the additional gravity necessary to explain the rotational velocity of stars in galaxies, and it is also supposed to be everywhere in the universe including here on Earth (albeit as yet undetected) then surely it would be exerting extra gravity here on Earth right now? Yet Einstein's General Relativity, sofar as I know, provides a perfect explanation for gravity here on earth, so the addition of dark matter would mean that there should be a lot more gravity here on Earth than there actually is!
I have also heard of the idea that dark matter exists as a halo surrounding galaxies, so perhaps the theory is that it only exists in certain parts of the universe. But if so, why would we be searching for it in deep mines on earth?
Have I misunderstood something? I am not a physicist and I have no understanding of maths. Thank you.
I have a puzzle about so-called dark matter. If it is supposed to supply the additional gravity necessary to explain the rotational velocity of stars in galaxies, and it is also supposed to be everywhere in the universe including here on Earth (albeit as yet undetected) then surely it would be exerting extra gravity here on Earth right now? Yet Einstein's General Relativity, sofar as I know, provides a perfect explanation for gravity here on earth, so the addition of dark matter would mean that there should be a lot more gravity here on Earth than there actually is!
I have also heard of the idea that dark matter exists as a halo surrounding galaxies, so perhaps the theory is that it only exists in certain parts of the universe. But if so, why would we be searching for it in deep mines on earth?
Have I misunderstood something? I am not a physicist and I have no understanding of maths. Thank you.