journey through space and time. who am i? what do i do?
TRANSCRIPT
Journey through SPACE and TIME
Who Am I?
What do I do?
1. Journey through space2. Journey through time
Destination 1 Nearest neighbour: the Moon
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Space travel: speed?
Cruising speed ~ 500Mph
Cruising speed ~ 17000Mph
Bristol to florida in 12 mins!
How long do you think it takes to get from Earth to the Moon?
250000 miles
15 hours in our shuttle
Destination 2 Nearest star...
Sol?
AlphaCentauri?
Betelgeuse? ProximaCentauri?
Why does the Sun shine?
Nuclear FUSIONReleases more energyHarder to control!
Nuclear FISSION:Splitting the atom
CONNECTION???
Destination 3 Nearest planet?
?
???
?
?
Earth
Mercury
MarsThe Sun
Venus
Mars-Earth closest approach27 August 2003
35 million miles!
In our space shuttle...86 days!
In reality...MRO took 7 months...
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Fly over the Martian surface
We need to put our foot down!
Solar System Fly-by
Jupiter:largest planet
63+ moons!
Picture: Voyager 1979
Saturn
Everyone’s favorite!
Picture: Cassini 2004
Uranus:
Also a gas giantSpins on its side!
Picture: Voyager 2 1979
Neptune:
Also a gas giantUranus’ twin!
Picture: Voyager 2 1979
Pluto???
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Relative sizes
Escaping the Solar System...
Pluto is 3660 million miles away...
It will take us 25 years!
Upgrade...Light speed: 670 million MPH5 hours to get to pluto!
Destination4 Nearest star: Proxima Centauri
Travel Time:4 Years, at light speed!
ProximaCentauri
Nearest star with planets:Epsilon Eridani
10 Years, at light speed!
(400,000 yrs in a shuttle...)
?
Ever seen this?
You are here!
100 billion stars
Destination 5 Centre of the Galaxy
What will we find?
26,000 years...
BLACK HOLE!!!
Death of star: supernova
How do we know ??
impressive Black Holes
Stars
CMB
AGN
Planets
GalaxiesGalaxies
ClustersClusters Clusters
RE
DS
HIF
T
Stars
CMB
AGN
Planets
GalaxiesGalaxies
ClustersClusters ClustersDIS
TA
NC
E F
RO
M U
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Destination 6 Andromeda Galaxy
Closest similar galaxyLargest in local group
2.5 million light years away
Zoom out: Hubble Deep field
A 2 millionth of the sky!!!
Galaxy cluster OPTICAL light
Stars
CMB
AGN
Planets
GalaxiesGalaxies
ClustersClusters Clusters
RE
DS
HIF
T
Stars
CMB
AGN
Planets
GalaxiesGalaxies
ClustersClusters ClustersDIS
TA
NC
E F
RO
M U
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Galaxy cluster X-rays
Galaxy cluster Radio waves
Zoom out again -galaxies form filaments and voids
The whole Universe is made up this way
Time for us to go home...
Fly through the cosmic web
zoom back to Earth...
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1. Journey through space2. Journey through time
IN THE BEGINNING...
EVERYTHING!
EVERYTHING!
EVERYTHING!
ENERGY INCREASING, BECOMING LIKE A BOMB...
STARTS EXPANDING...
Tick tick tick...
BOOM!
The Big Bang
Not really an explosion, Universe expanded rapidly as a whole
(Universe is still expanding today as a result of the Big Bang)
Matter was created in the form of tiny particles (protons, neutrons, electrons)
Too hot for normal stuff to form (eg atoms, molecules)
COSMIC SOUP
PROTONNEUTRON
ELECTRON
COSMIC SOUP
Universe much cooler, atoms start to form...
Hydrogen, Helium, normal stuff
300,000 Years Later...
Universe is now a GAS
HYDROGEN
HELIUM
Universe is now a GAS
GRAVITY!
Gravitational Collapse
We started with a uniform gasSmall regions became more denseThe denser regions had larger gravity and started to pull other particles towards them
The gaseous Universe began to look clumpy
Stars, galaxies
Temperature increases
FUSION!
A star is born
Stars congregate Together to formGalaxies.. Galaxies Also congregate...
The Universe today
Future?
The Universe is still expanding
All galaxies are moving apart The explosion of the big bang is still happening!
It may contine expanding forever
Or is may stop expanding, and fall inwards in a big CRUNCH!
THE END