http://www.snopes.com/science/coriolis.aspWater wirlpools clockwise in the southern hemisphere and anticlockwise in the northern hemisphere.
On the equater water moves straight down the whole with no spinning.
There is actually a tourist attraction on the equator in one of the countries crossing it, where you can watch water move straight down ;p
although there are people saying its a myth, ive seen it first hand, it actually did spin in different directions in different hemispheres.
It's the dust being bombarded by light at frequencies above that of optical light. The dust heats up and scatters this light at lower frequencies from IR to optical red. This obscures everything in the visible part of the EM spectrum. The galaxy also has a halo of old stars that give it a spherical glow.I have been watching a large amount of the series 'Cosmos' by Carl Sagan and was wondering. What it the large glowing center to our galaxy? And why is it that the galaxy is spiraled?
The structure of the galaxy is due to gravitational forces. In spiral galaxies you can discern galactic arms consisting of gas, dust, stars etc. and then interarm regions that are more sparsely populated. All of this is "circling the drain" that is the supermassive black hole at the centre of the galaxy.
Gravitational perturbations also occur as galaxies tend to congregate into local groups. One example is the interaction of our galaxy with the Small Magellanic Cloud, which is a nearby dwarf galaxy.
More details and pictures here: