In the likely event that you're in the dark as to what the universe looks like, let me enlighten you. This universe (for it is probable that there are many) is comprised of a few hundred billion galaxies. These galaxies are not scattered completely randomly, but are instead spread out in a three dimensional stringy web-like pattern. A good analogy that has been made for this is a load of washing-up bubbles, where the washing-up liquid that makes up the bubbles themselves represent the galaxies, and the air within the bubbles represents the vast gaps of nothing in the universe.
Theoretical physicists have the problem that they don't know how the universe got into this state. Well, it seems pretty obvious to me. I mean, I'm no astrophysicist, but it's hardly rocket science: The galaxies remain in a stretched out web pattern because matter naturally distorts space-time, which has an instantaneous effect on the propagation of any and all matter relative to both the distance and the combined mass of any and all of the masses within the system. The net effect of all of this intergalactic mass is a sort of mass intergalactic net effect, and the appearance of the universe as it has been observed fits in exactly as predicted by the above model.
You probably realised that this is a description of gravity, but I really wanted to explain what is happening without confusing matters... and people seem to get confused whenever someone mentions the G-word. They think it's a force or something! ...the idiots.
So what's the prob?
The cosmic boffins still have the issue of explaining why the universe is still expanding, when gravity should've started making it contract by now. They've attributed this to Dark Energy [cue mystical/scary music].
Dark energy is just a phrase they've invented, because they can't think of they're own explanation that doesn't involve magic, witchcraft, god or anything else made up.
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