Transcript here - University of Virginia

Cosmic Scales
Two diagrams using our location in
Charlottesville and the US to portray
the size of the galaxy, and the size of
the visible Universe.
Our Galaxy
Earth
Sun
Earth orbit
Solar system
Nearest star
=
=
=
=
=
100 nm
10 μm
¼ cm
20 cm
250 m
=
=
=
=
=
virus
cell
pin head
saucer
lawn
Jewel Box
Cluster
Naked eye
stars
Eagle
Nebula
Galaxy Center
Crab
Nebula
Solar system
13.7 Gly
The Visible Universe
MW galaxy
Local group
Virgo cluster
Coma cluster
=
=
=
=
20 m
600 m
15 km
100 km
Keck/VLT
+ Cluster Lens
=
=
=
=
0
class room
central grounds
Walmart
Culpeper
SDSS &
2dFGRS
“Nearby”
galaxies
HDF
Our Galaxy