Inferring stellar lifetimes: Scientists must often draw on a ...

[Cooldude101]

Inferring stellar lifetimes: Scientists must often draw on a variety of concepts to develop new understanding. Take, for example, the inferred lifetimes of stars.
 
  What two properties must be precisely measured in order to estimate the lifetime? Outline the set of observations that must be made in order to determine those properties. Then discuss the fundamental physics that must be understood to relate these to the rate at which hydrogen is converted to helium in the stellar core, and to determine the amount of hydrogen available in the core.

Question 2

Jupiter and the other gas giants formed close to the sun and migrated outward.
 
  Indicate whether the statement is true or false

[billybob123]

Answer to Question 1

Should include description of the measurements of apparent brightness and distance to determine luminosity, and observations of eclipsing binaries to determine stellar masses. Then the answer should reference the known energy release from each set of four hydrogen nuclei converted to helium, and the importance of understanding the behavior of gases to predict how much of the star's mass is in the high pressure / high temperature core.

Answer to Question 2

FALSE