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Final Jeopardy
Spectra
Stars
Time
Vocabulary Miscellaneous
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By measuring the red-shifts of the most distant
galaxies, it is possible to calculate the
a.
b.
c.
d.
Doppler shifts
apparent magnitudes
absolute magnitudes
expansion rate of long ago
Expansion rate of
long ago
The diagram above shows a standard
spectrum compared to that of a distant
star. From this figure, what can you
conclude about this stars motion relative
to Earth?
The star is moving away from earth
(red shift)
A solid, opaque object can be heated
to different temperatures. What
happens to the luminosity and
wavelength of the light emitted by
this object as the temperature
increases?
Brighter and
shorter wavelength
What type of
spectra does an
incandescent light
have compared to
Helium gas?
Incandescent – continuous
spectrum
Helium gas- emission line
spectrum
How far does a radio wave
travel in 6 minutes? (speed of
light 3 x 108 m/s).
D=sxt
(3 x
8
10 )(3.6x
10.8 x
1.08 x
2
10 )
10
10
11
10
m
Why is star C brighter
than star D?
C is hotter
Why is star B brighter
than Star A?
Star B (main
sequence) is larger
The fusion of
hydrogen to helium
occurs in what type
of stars?
Main sequence
stars like the sun
As time goes on, what will happen
to the ratio of Hydrogen to Helium
in this star?
Helium increase as
hydrogen decrease
The sun is in equilibrium
meaning it neither shrinks
nor grows, this is due to a
balance between what two
features?
Gravity and gas
pressure
•An astronomer uses a telescope to observe a star.
The color of the star indicates that it has a size and
surface temperature similar to that of the Sun. Using
this information, the astronomer can conclude that
the star
1.is older than the Sun.
2.will survive for several billion years.
3.is moving very quickly away from Earth.
4.has a mass similar to the mass of Jupiter.
Will survive
several billion
years
How long will a star
with the same mass
as the sun stay on
the main sequence?
10 billion years
According to Big
bang, age of
universe is
calculated to be
about how old?
13-14 billion years
As mass increases, what happens to
the life span of a star?
As mass increases, stars do
not live as long
About how long would a star
with a mass 1.5 times that of
the sun live?
5 billion years
Theory that states
universe began as
pure energy
Big Bang
FREE
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The group our
milky way galaxy
belongs to
Local Group
Used to measure the
distance of stars
within 1,000 light
years of earth
Parallex
You look at two stars in the
night sky and notice one
appears brighter. What
property or characteristic of
the star is this?
Apparent
magnitude
Evidence suggests the
universe contains a
great amount of
___________matter
Dark matter
How long after Big Bang did
it take universe to cool to
9o
10 C?
3 minutes
Heaviest element
formed in core of a
star?
iron
According to recent
observations, what is
occurring to the rate of
expansion of universe?
Rate of expansion
is speeding up
If the mass of our
sun were reduced
by one half of its
current mass,
approximately how
much longer would
it live compared to
its current mass?
5 billion
years
(15b-10b)
Make your wager
1. What occurs in a main
sequence star?
2. What does a main
sequence star the size of
our sun change to after
this process ends?
1. Hydrogen fuses
to Helium
2. Red giant