College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000



College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

Andromeda galaxy is the closest large galaxy and is visible to the naked eye. Estimate its brightness relative to the Sun, assuming it has luminosity l012 times that of the Sun and lies 2 Mly away.

To determine

The brightness of Andromeda galaxy relative to Sun.


Given data:

Luminosity is 1012.

Radius of the Andromeda galaxy is RAndromeda=2×106×9.46×1015m/ly.

Radius of Sun is rsun=1.496×1011m

Formula used:

The formula for brightness of the Andromeda galaxy,

  RelativeBrightness=luminosity×4πrsun24πRAndromeda2   ......... (1)


Substitute the given value in equation (1)

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