Milky Way - Observations

Andrew Conway

Galaxies are faint

Empire Strikes Back Galaxy

Copyright: 20th Century Fox


Our galaxy - the Milky Way

The Milky Way - from inside

Milky Way

Source: Steve Jurvetson CC BY 2.0

The Milky Way - from outside

Milky Way external_

Source: NASA/JPL-Caltech/ESO/R. Hurt Public Domain

The Milky Way - schematic

Milky Way schematic

Source: RJHall CC-BY SA 3.0

Metallicity in our galaxy

Astronomers refer to the fraction of all elements other than H and He as metallicity.

Observing hydrogen

The Milky Way - observations

Milky Way observations

Source: Rursus CC-BY SA 3.0

The Milky Way - rotation

Milky Way rotation

Red - theory; Blue - observed; Yellow - the Sun

Source: Brews ohare CC-BY SA 3.0

Dark matter

Small and large Magellanic clouds

Small and large Magellanic clouds

Source: ESO/S. Brunier CC-BY SA 3.0

Satellite galaxies?