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accepted Recommended progression with which to learn physics for fun
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comment Why is absolute zero considered to be asymptotical? Wouldn't regions such as massive gaps between galaxy clusters have temperatures of absolute zero?
You mentioned that "the only way we can get heat out is to place our system in contact with something cooler" - but what about techniques that don't use thermal conduction, e.g. laser cooling?
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comment Why can we see the cosmic microwave background (CMB)?
@Alfe: There are many things that we don't know for certain, however the universe's size does not correspond directly to its age for various reasons (for example, inflation). In addition, the universe does not have a "center" from which the CMBR began propagating - it began propagating from roughly every point in the universe as the temperatures cooled. So we will never "see the last of" the CMBR, we will merely see it cool and become more sparse.
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