Description
Objectives:
1.To understand the concept of Hubble’s law
2.To measure the redshift of several galaxies which Hubble observed by using galactic spectra
3.To measure the angular size of these galaxies
4. To determine if any relationship exists between the galactic redshift and angular size
5. To explore what that relationship means and what it implies about our universe

Explanation & Answer

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ONLINE PHYSICAL SCIENCE II
Name:
Lab Activity
”Hubble’s Law”
Overview:
In the 1920's Edwin Hubble investigated the relation
between distance to galaxies and their velocity toward or
away from us. He found that most galaxies are moving away
from us. In a paper published in 1929, Hubble reported a
linear relation between distance and velocity, now known as
the Hubble law. One of the implications of Hubble’s law is
that our universe is expanding and thus had a beginning.
To prepare for this lab activity you should carefully read
through pages 413-419 of your textbook which covers
Hubble’s law. In this lab activity you will make use of a
simulation to explore various aspects of Hubble’s law.
Objectives:
1. To understand the concept of Hubble’s law
2. To measure the redshift of several galaxies which Hubble observed by using galactic spectra
3. To measure the angular size of these galaxies
4.
To determine if any relationship exists between the galactic redshift and angular size
5. To explore what that relationship means and what it implies about our universe
Theory:
Hubble used the redshift of galaxies
he observed to determine their
velocity. All galaxies emit a wide
spectrum of light of various
wavelengths. But these spectra have
something in common: the calcium H
and K absorption lines. These are
particular wavelengths of light that
have rest values of 3933 angstroms
(for K) and 3968 ang...
