The Astronomical Unit
Earth to Sun is around 1 AU
It is a useful unit to use to measure distances in the Solar System.
•
•
•
•
National Schools'
Observatory
•
•
•
•
of stars, dust and gas, all
held together by gravity.
Factfile: Galaxy
A galaxy is a collectionof stars, dust and gas, all
held together by gravity.
Galaxies come in all
shapes and sizes, and
the larger ones contain
1,000,000,000,000 stars.
The galaxy we live in is
called the Milky Way.
•
•
•
•
Spiral galaxy
Spiral galaxy
•
•
•
•
National
Schools'
Observatory
National
Schools'
Observatory