The Signature Of The Stars Worksheet Page 5
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6The Expanding Universe
7.
Plot
t he
s peed
o f
e ach
g alaxy
i n
T able
1
o n
t he
y -‐axis
a nd
t he
d istance
t o
t he
g alaxy
o n
t he
x -‐axis.
D raw
a
l ine
o f
b est
f it.
8.
Calculate
t he
s lope
o f
t he
l ine.
W hat
i s
t he
u nit
f or
t he
s lope?
9.
The
s lope
o f
t his
l ine
i s
c alled
t he
H ubble
c onstant,
H
.
W rite
t he
e quation
f or
t his
l ine
u sing
H
a s
y our
s lope.
W hat
d oes
i t
t ell
0
0
you
a bout
t he
r elationship
b etween
t he
s peed
o f
g alaxies
a nd
t heir
d istance?
T his
r elationship
i s
c alled
H ubble’s
l aw.
10. The
a ge
o f
t he
u niverse,
T ,
c an
b e
a pproximated
b y
t aking
t he
r eciprocal,
o r
i nverse,
o f
H
.
T ake
t he
r eciprocal
o f
y our
s lope.
0
How
o ld
i s
t he
u niverse
( in
y ears)?
Activity 2
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