Answered: A galaxy is 30 Mpc away from us and has…

A galaxy is 30 Mpc away from us and has a recession velocity of 2000 km.s-1 . What is Hubble’s constant based on these values?

Stars and Galaxies (MindTap Course List)

10th Edition

ISBN:9781337399944

Author:Michael A. Seeds

Publisher:Michael A. Seeds

Chapter18: Modern Cosmology

Section: Chapter Questions

Problem 5P

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Concept explainers

Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.

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A galaxy is 30 Mpc away from us and has a recession velocity of 2000 km.s-1
. What is
Hubble’s constant based on these values?

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