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Lecture 7

AST 101 Lecture Notes - Lecture 7: First Observation Of Gravitational Waves, Gravitational Wave, Neutron Star

Course Code
AST 101
Walter Freeman

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Presentation 1:
Newton - time and space are absolute and independent of one another
Einstein space and time are intertwined/ the universe is made of space time
Gravity is a curvature in space time
More mass means more curvature coin well spin in malls
Gravitational waves change geometry to each object
Effect is very small on people, cannot be seen
Neutron star (size of city, mass of 2 suns) very dense- slightly visible
LIGO laser interferometer gravitational wave observatory
Interferometer shows the interference of light waves
GW150914 first one 2 black holes combined
Gravitational waves completely different spectrum than light
Presentation 2:
Ancient Astronomy
Ancients had close relationship with the sky its actions directly correlated with those on earth
Look at the moon face/rabbit/nothing
Equator wet and dry season- crescent as a cup
Stars move around NCP counter clockwise
SCP clockwise
Equator neither, move straight up
Polynesia islands to guide them/stars rose straight up
The phases of the moon
Change is regular pattern of phases repeats every 29.5 days
Moon differs from the stars bc it does’t ake its ow light
Half of the moon is always lit by the Sun (half day and night)
New moon: nothing visable
Crescent less than half visable
Half moon half of the moons surface is visable
Gibbous more than half visable
Full moon all visable
Waxing tomorrow the moon will be more lit than today
Waning tomorrow the moon will be less lit
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