Errata:

pg. 50: The solar corona is millions, not billions, of degrees.

pg. 53: The footnote on magnetism is wrong. Either the Earth's "N" pole is a magnetic S pole, or the "N" pole on a magnet is a S pole. Can't have both. The first is usual, in my experience.

pg. 218: A white dwarf doesn't shine at "thousands of times the luminosity of the present-day Sun". Even at a temperature like the one mentioned, its luminosity would be about 1 solar luminosity (its surface brightness would be thousands of times higher, though).

pg. 221: white dwarfs don't cool to invisibility after a few million years. I believe standard estimates have them still hotter than the Sun (photosphere) after a billion years. ("Invisibility" is relative, of course - even an O star is invisible at 5 Gpc - but there is no substantial change in luminosity after only a few million years.)

pg. 244: first full paragraph, I think it should say that the galaxy's magnetic field is good at deflecting intergalactic cosmic rays, not galactic.

pg. 272: The Grand Unification Epoch involved the unification of the strong and electroweak forces - it didn't include gravity.

Response to some other posts:

geonuc: Astrophysical objects like quasars and GRBs regularly accelerate particles to ultrarelativistic speeds. The neutrinos from SN1987A arrived before the light, even though they were emitted only hours earlier. (This supernova was about 150,000 light years away.)

hhEb09'1: Radiation energy loss depends on the difference in effective temperatures of the planet and of the sky. During the day, the sky is hot, during night, it is not (although hotter with cloud cover than without). Thus, it gets colder at night, and colder in winter due to longer nights and lower sky temperatures during the day.

The tidal force distinction has to due with the fact that "tidal force" isn't a fundamental force, it's simply the result of gravity (the actual force) being different in two spots. Calling it a tidal force is just a convenient shorthand.