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ihateuutube (December 31, 1969 at 6:59 pm)
ok, nvm maybe you weren't thinking that.
ihateuutube (December 31, 1969 at 6:59 pm)
I know what you're thinking. Dark matter is meant to account for the increased speed of stars on the farther edges of galaxies. Supermassive black holes are thought to exist at the centers of all galaxies. Why couldn't a black hole be causing this increase in speed? The reason is that a black hole would still accelerate the central stars more than the outer ones. You would still see a decrease in speed as you moved outward.
robotaholic (December 31, 1969 at 6:59 pm)
physics is badass
jetmanisme (December 31, 1969 at 6:59 pm)
Black holes on the other hand defined as an object from which no light can escape within a certain distance. Basically they're created when enough matter/energy gets scrunched into a short enough distance such as when a large star runs out of fuel and collapses in on itself via gravity. Think of it as a cosmic drain; it's not dangerous unless you get within a certain distance and then you'll be pulled into what can be considered to be the ultimate trash compactor. Hope this helps.
jetmanisme (December 31, 1969 at 6:59 pm)
Hi eddylevin,Dark Matter and Dark Energy are vastly different from black holes. Dark Matter is just a fancy name for "we don't know what it is." We can't see it directly or know what it is, but we know it's there because of its gravitational effects. Dark Energy is also something that we don't know what it is, but know it's there because space is expanding while it shouldn't be given the amount of matter in the universe. Therefore, there must be some energy making the universe expand.
halcyonyear (December 31, 1969 at 6:59 pm)
That was awesome. The mystery in physics has been restored.
eddylevin (December 31, 1969 at 6:59 pm)
Woderful exposition of a new vista, but what is the difference /similarity between black holes at the centre of the Galaxy and the black space and black energy throughout the cosmos. Are they the same thing as the black holes?
kubush (December 31, 1969 at 6:59 pm)
No. The universe is infinite in size. There is no end.watch?v=K6VkKk9iVQk
Viodin0 (December 31, 1969 at 6:59 pm)
i wonder whats happens when you get to the end...because if its expanding, its expanding from its outer limits outwards right?....i wish we could go fast enough to reach the end just to see the result...
WhatisaJugallo (December 31, 1969 at 6:59 pm)
We know that what we know about 'normal' matter now is good because scientists have been trying to disprove it for dozens of years and found nothing but more verification. If someone puts forward a new theory of Newtonian/quantum physics that redefines how we look at matter that theory will be subject to the same rigorous attempts to disprove it and if it survives that then whoever came up with it would be heralded as one of the smartest scientists in history. |
