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Scales of Scales of the the
UniverseUniverse
The Earth is 12,700 km in diameter.
The Sun is 1.39 million km in diameter.
Imagine the Sun is the size of the classroom.
How large would the Earth be?
The size of a grapefruit(9.2 cm diameter)or small globe
Now imagine that the
Solar System (to the
boundary of the solar
winds) is the size of
the classroom
. (200 AU
diameter)
1 Astronomical Unit = 149,597,870,700 m
or, roughly the distance between the Earth and the
sun. http://www.youtube.com/watch?v=sBap15NWmsI
How large would the sun be?How large would the earth’s
orbit around the sun be?How large would the earth be?
Sun: a grain of salt (0.46 mm diameter)
about the diameter of the tip of a toothpick
Orbit: a CD or half a roll of masking tape (10 cm diameter)
Earth: microscopic bacteria (4 micrometers – 4 millionths of a
meter)
Now imagine the solar neighborhood (the closest
stars to the sun; 65 light-years diameter) were the size of the
classroom.How big would the solar
system be?
A light-year is a measure of distance, not time.
9.4605284 × 1015 metersThe distance light travels in a
year.
A grain of salt (0.49 mm diameter)
about the diameter of the tip of a toothpick
Now imagine the Milky Way (160,000 light-years) is the size
of the classroom.How big would the solar
neighborhood be?
The Milky Way is our galaxy, made up of over 100 billion
stars.
A peppercorn (4mm diameter)about the size of a piece of gravel
Our Local Group of
Galaxies is made up of
3 spiral galaxies (Milky Way,
Andromeda –M31,
and Triangulum -M33), plus
several dwarf
galaxies
Now imagine the Local Group of Galaxies
(6.5 million light-years across) is the size of
the classroom. How big is the Milky
Way?
The size of a large
pizza (50 cm in
diameter)
A Supercluster is a cluster of clusters. The Virgo
Superclustercontains
over 1000 galaxies.
Imagine the Local
Supercluster of Galaxies (130 million light-years) is the size of
the classroom. How large is
the Local Group?
How large is the Milky
Way?
Local Group: A basketball or globe(25
cm in diameter)
Milky Way: A button
(1.25 cm in diameter)
about the diameter of a large thumbtack
It is believed
that there are over
100 billion galaxies.
The Observable Universe is 156 billion light-years in diameter.
Imagine the entire
observable universe were the
size of the classroom. How large would the
Local Supercluste
r be?How large would the
Local Group be?
Local Supercluster: A small
button (8.3 mm
diameter)about the diameter of
a large thumbtack
Local Group: A small
grain of salt (0.2mm
diameter)