Attached you will find the outline and answer for your assignment. Please let me know is you need modifications or clarification 😀
The classification system of galaxies, invented by Edwin Hubble, is shaped like a turning fork and
it's divided in two major categories:
Elliptical galaxies look like a football, are red and rounded with one part longer than the other.
They contain very little cool gas and dust. They often contain very hot ionized gas. They appear
on the "handle" at the left, designated by the letter E and a number. The larger the number, the
flatter the elliptical galaxy: An E0 galaxy is a sphere, and the numbers increase to the highly
elongated type E7.
Spiral galaxies look like flat white disks with yellowish bulges at their centers. The disks are
filled with cool gas and dust, interspersed with hotter ionized gas, and usually display beautiful
spiral arms. They appear on the two forks and are designated by the letter S for ordinary spirals
and SB for barred spirals, followed by a lowercase a, b, or c: The bulge size decreases from a
to c, while the amount of dusty gas increases. Lenticular galaxies are designated SO, and
irregular galaxies are designated Irr (not rounded galaxies).
To observe and classify galaxies using the Hubble’s classification system of galaxies by its shape
using the Stellarium software.
Most galaxies are barred spiral galaxies due it's continuous expansion since they were created.
Bright in t...