Chapter 16, Problem 1VSC

To determine

The technique that used to measure the distance $10$ million light-years away.

Answer to Problem 1VSC

Solution:

Cepheid variable stars technique is used to measure a distance of $10$ million light-years.

Explanation of Solution

Introduction:

An effective technique is used to measure a large distance between astronomical objects.

Cepheid variables stars are extremely luminous and can be observed and measured at a large distance. There is a definite relation between the period and luminosity of Cepheid variables. With the help of period-luminosity relation to large distance such as between galaxies can be found.

Conclusion:

Cepheid variables stars radiate pulses. On the bases of the luminosity of cephids, we can measure the distance between an object which is at a distance of $10$ million light-years.