galaxies sara
TRANSCRIPT
GALAXIESBy Sara Kowdley
Elliptical galaxies [1] are spheroid-shaped. We can see only 2 of 3 dimensions of them from earth, so they look like elliptical disks. They have no particular axis of rotation. There is a complicated classification system within it. The galaxy could be ranked from E0 – E7, E0 being perfectly circular and E7 being flattened.
ELLIPTICAL
Elliptical galaxy photos:
Spiral Galaxies [2] are made up of 3 main parts – the nucleus/bulge, disk, and the halo. The bulge, in the center of the galaxy, is spherical and contains older stars.
SPIRAL
Spiral galaxy photos:
See how these are more tightly wound?
S0 Galaxies [3], also called Lenticular galaxies, are between an E7 and a “true” spiral SA. They are different than elliptical galaxies because they have a bulge AND thin disk, yet NO spiral structure of any kind.
S0 GALAXIES
S0 galaxy photos:
Irregular Galaxies [4] have no regular or symmetrical structure. The two types are IrrI and IrrII. Irr type 1 have HII (elemental hydrogen gas and young hot stars) regions, whereas Irr type 2 galaxies have large amounts of dust that block starlight, making it hard to distinguish stars.
IRREGULAR
Irregular Galaxy Photos:
All Done!Goodbye !Au revoir !Sayonara!
Adios!Zai jian!
Ciao!Farewell!
Peace out!