DEVELOPMENT
Spiral galaxies
have got it
going on...
Galaxies are divided into three types
according to Edwin Hubble’s model.
Spiral galaxies such as the Milky Way
create the highest numbers of new stars
and are more variable than other galaxies.Irregular galaxies
These galaxies have no distinct
shape and often orbit bigger
galaxies. They include far fewer
stars than other types of galaxies.Spiral galaxies
Spiral galaxies include
far more gas and dust
in their spiral arms. New stars
can form there, so that spiral
galaxies can be very dynamic.Elliptical galaxies
Galaxies of this shape are
the biggest astronomers
know about. In elliptical galaxies,
many of the stars are very old.SHU
TTE
RST
OC
KThe galaxies of the universe form stars
and merge with other galaxies in huge
patterns over billions of years.44 | SCIENCE ILLUSTRATED
SPACE GALAXIES