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Transcript
A walk through the Universe

Space is big. You just won’t believe
how vastly, hugely, mind-bogglingly
big it is. I mean, you may think it’s
a long way down the road to the
chemist’s, but that's just peanuts
to space.
 Douglas
Adams,
The Hitchhiker's Guide to the Galaxy
English humorist & science fiction novelist
(1952 - 2001)
1
2
The Earth
We are
here
3
4
Venus
Mercury
Mars
EARTH
5
6
Uranus
Jupiter
Neptune
Earth
Pluto
(not a planet)
and its moon
Charon
Saturn
7
The Sun
is our nearest star
8
The Solar
System
9
The Milky Way
(Our Galaxy)
A hundred, thousand, million stars!
10
the Milky Way
as seen from
the Enterprise
Light would take
100 000 years to
travel across
the galaxy.
A hundred thousand light years across
11
Distances


It takes 8 minutes for light to reach us
from the Sun.
A light-year is the distance travelled by
light in 1 year.

The Sun is our nearest star.
Our next nearest star, Alpha Centauri is
4 light years away.

The Milky Way is 100 000 light years
across.

12
The local group of galaxies
Andromeda is
the nearest big
galaxy to the
Milky Way
Milky
Way
13
Light from Andromeda takes
2 million years to reach us.
Milky
Way
Andromeda
14
The Local Supercluster
Here the local group has shrunk to the size of the
Milky Way in the last slide.
Local
group
15
Light from Virgo has taken 65 million
years to reach us. It left when the dinosaurs
were on Earth.
Virgo
Cluster
16
The Universe is mind-bogglingly big!



The Sun is about 150 000 000 km away
from Earth
Bright stars in the night sky are about
1000 000 (1 million) times as far away
as the Sun.
The near galaxies are about 100 000
times as far away as the bright stars.

15 000 000 000 000 000 000 km
17
NASA
18