Chapter 11: Surveying The Stars  Created by skylerself   Remove
ads  51 terms · surveying the stars  What is the approximate
chemical composition (by mass) with which all stars are born?
three quarters hydrogen, one quarter helium, no more than 2%
heavier elements  The total amount of power (in watts, for
example) that a star radiates into space is called its
_________.   According to the inverse square law of light, how
will the apparent brightness of an object change if its distance
to us triples?  Its apparent brightness will decrease by a
factor of 9.    If star A is closer to us than star B, then Star
A's parallax angle is _________.  larger than that of Star B
Ten parsecs is about _________.  32.6 light-years. (1
parsec=3.26 ly)  Star A has an apparent magnitude of 3 and star
B has an apparent magnitude of 5. Which star is brighter in our
sky?  Star A  From hottest to coolest, the order of the spectral
types of stars is _________.   Our Sun is a star of spectral
type _________.  G (2)   The star is a