Which of these is the best method to estimate the speed at which a star is moving away from earth?

measure the star's red shift

calculate the pitch due to changes in frequency of light

calculate the parallax due to changes in earth's position

measure the star's blue shift

The best and most correct answer among the choices provided by your question is the first choice or letter A.

The best method to estimate the speed at which a star is moving away from Earth is to measure the star's red shift.

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The answer to your is is c motion and shape

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -