napalmbrain, just wondering about the gravity thing, where you talking about einsteins bowling ball theory? where if you drop a bowling ball onto a sheet, everything gets sucked into that spot and thats what creates gravity?
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crazyman2 said:Napalmbrain, that would be einsteins theories of relativity and crap. and by theories i mean none proven empirical facts. although what you said could be right when considering black holes. But since it is not believed a black hole has yet to be formed in the universe, it will be sometime before that can be proven. it is still generally accepted to be correct that gravity is caused by the attracting of 2 bodies of mass.
crazyman2 said:napalmbrain, just wondering about the gravity thing, where you talking about einsteins bowling ball theory? where if you drop a bowling ball onto a sheet, everything gets sucked into that spot and thats what creates gravity?
Napalmbrain said:Take it from someone "in the biz": most scientists consider the theory of relativity to be true. It provides good explanations for the failures of Newtonian physics and has so far survived every test put to it.
Also, most scientists believe that plenty of black holes exist in the universe, and with good evidence. Take the centre of the Milky Way Galaxy for example. A bunch of stars there are moving around something with a mass of over a million times that of the Sun, and yet we cannot see it.
Yep, that's the general theory of relativity.
DRMARIO said:How can black holes not be real. We have images from hubble..and it's widely believed that they're at the centre of all spiral galaxies.
What is a little odd, how ever, is that..you know the gravitational curve? The graph that shows velocity decreases when an object is orbiting from a larger distance?
Well that's true with solar systems..but not spiral galaxies. The outer part of the galaxy has the same velocity as the more inner parts.
Come to think of it..Isn't that why they came up with the the theory of dark matter, and dark energy? 4% Atoms, 21% Dark Matter, 75% Dark Energy.
Happy said:The mayans or w/e they're called couldn't be bothered to finish off their calender, they had to stop somewhere..
DRMARIO said:You're horribly confused.
I mentioned the gravitational curve?
Right, well, in our solar system, the velocity of the planet decreases when gravity is acting upon the planet more weakly than the closer planets. Sounds about right.
But when we look at spiral galaxies (Galaxies with solar systems orbiting a black hole) We see that the solar systems on the very outer part of the galaxy are travelling with the same velocity as the planets closer to the black hole.
Seems impossible..So they totted up how much matter would need to be in the galaxy in order for this to make sense (More matter, more gravity..so it'd sound right that outer objects would still travel with a high velocity) and it seemed that there just wasn't enough mass.
SO, they came up with the idea of dark matter. Basically, it's matter that theoretically exists..but we can't detect it.
Of course, not everybody believes this..but it's a commonly accepted theory.
There is one scientist who rewrote the laws of physics..so that 'variable gravity' existed..But no-one really takes him seriously.