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Do all galaxies have the same elements in the same ratios?

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We'd have to observe every single one of the 200 billion galaxies long enough to determine its motion relative to all the others, then compensate for its distance in light years to predict its plane at any particular time. How would we treat globular clusters? Where is their plane? read more

Smaller galaxies seem to have spins aligned with the filaments - this is because they're mostly made by matter falling in from the filaments rather than by merging galaxies together (although this happens, too, as galaxy formation is pretty messy). read more

It appears essentially the same in all directions (it is isotropic). It was discovered by Penzias and Wilson in the early 1960s. It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. It had a much higher temperature in the past. It has a temperature of about 3 degrees K above absolute zero. read more

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