Problem 5

Given information

The precise calculation of the distance of a star outside our galaxy will be based on the red shift in the line spectra of atoms and compounds.

Step-by-step explanation

Option a is incorrect since the parallax method can only be utilised for distances of up to 100 light years. The Milky Way galaxy is 100,000 light years across.

Option b is incorrect because the luminosity and temperature measurements obtained from the H-R diagram may fluctuate due to the galaxies' relative velocity.