Astronomers Have Recently Compared the Relative Abundances of Different Isotopes

Multiple Choice

Astronomers have recently compared the relative abundances of different isotopes of neon found in Moon rocks with those found in the solar wind. What conclusion have they drawn?

A) The Sun is much younger than previously thought.
B) The Sun was much hotter in the past than was previously believed.
C) The Sun was much cooler in the past than was previously believed.
D) The Sun has maintained a much more constant temperature than was previously believed.