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New P1

An updated version of P1
by

Pete Davis

on 24 May 2016

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Transcript of New P1

8 Topics
Solar system
Beyond the solar system
Observing space
Big Bang
Wegener
The Structure of the Earth
Seismic Waves
Waves
Solar System
Beyond The Solar System
P1 The Earth in the Universe
M
y
V
ery
E
asy
M
ethod
J
ust
S
peeds
U
p
N
aming
P
lanets
Milky way is our galaxy
Observing space
When we look into space we see it as it was in the past.
The sun 8 minutes ago
The Pole Star 420 years ago
Andromeda galaxy 2.5 million years ago
Big Bang
Wegener
The Structure of the Earth
Seismic Waves
Waves
Asteroids are rocky
Comets are dust and ice
They have highly elliptical orbits
The solar system is about 5 billion years old
The sun is a star
energy comes of
from the fusion of
Hydrogen into Helium
200-400 Billion Stars
In the Milky Way
Estimated number of Galaxies
100-500 Billion !
A Light year is the distance travelled by a photon of light in one year.
It's about 6 trillion miles
Universe 13.7 Billion years old
A billion = 1000 million
Sun 5 billion years old
Earth 4.6 billion years old
Millions of kilometres- distance between planets.
10's - 100's light years - distance between stars.
100,000 light years - size of Milky Way
Millions of Light years - distance between galaxies
Light pollution and the atmosphere makes it difficult to see all stars
Solution
Remote mountain tops
Space
Parallax
remember this drawing
The smaller the parallax angle
the further away the star is !
Another method for
measuring distance
is brightness
The radiation given out by a star
helps
us estimate

its size an
d temperature
Size and temperature decides its luminosity
Stars with high luminosity that look faint from Earth must be far away
Coastlines fit
Rocks match
Fossil match
p waves longitudinal pass through solids and liquids
s waves transverse pass through solids only.
The Wave Equation is: Speed (v) = Frequency (f) x Wavelength (mλ)
Frequency = number of waves per seconds
3 pieces of evidence
red shift - microwave background radiation- Hydrogen/Helium composition
Full transcript