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Chapter 34: Q1PE (page 1238)

Find the approximate mass of the luminous matter in the Milky Way galaxy, given it has approximately\({\rm{1}}{{\rm{0}}^{{\rm{11}}}}\)stars of average mass\({\rm{1}}{\rm{.5}}\)times that of our Sun.

Short Answer

Expert verified

The mass is obtained as: \({\rm{3 x 1}}{{\rm{0}}^{{\rm{41}}}}\).

Step by step solution

01

Define Cosmology

Cosmology is the study of the character and evolution of the universe.The two most important features of the universe are the cosmological red shifts of its galaxies being proportional to distance and its cosmic microwave background (CMBR).

02

Evaluating the mass

It is given that we have:

\({\rm{1}}{{\rm{0}}^{{\rm{11}}}}\)stars.

It has an average mass of \({\rm{1}}{\rm{.5}}\) solar mass \({\rm{(}}{M_0} \approx {\rm{2 \times 1}}{{\rm{0}}^{{\rm{30}}}}{\rm{kg)}}\).

The total mass is then obtained as:

\({\rm{1}}{\rm{.5 x 1}}{{\rm{0}}^{{\rm{11}}}}{\rm{ x 2*1}}{{\rm{0}}^{{\rm{30}}}}{\rm{ = 3 x 1}}{{\rm{0}}^{{\rm{41}}}}\)

Therefore, the mass of the luminous matter in the milky way galaxy is is: \({\rm{3 x 1}}{{\rm{0}}^{{\rm{41}}}}\).

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