Huge gravitationally bound collections of stars with very little else between them.

Not that

The small and large magellanic clouds (the SMC and the LMC)

Andromeda Galaxy M31

Triangulum Galaxy M33

Large Milky band stretching across the sky

Not that

We are looking into the plain of our galaxy from one of its spiral arms

Not that

A giant disk shaped Catherine Wheel rotating around a central bulge

In the Summer Triangle

In a line from Cassiopeia to Cygnus

In the Winter Triangle

The galactic centre lies in Sagittarius

A bulge surrounding the nucleus (black hole)

The disk - Globular clusters (dense groups of relatively old stars) Spherically distributed along the galactic centre

The halo - Young stars, gas and dust - Four major spiral arms - Is 1-2kpc thick - 30kpc in diameter

The disk - Young stars, gas and dust - Four major spiral arms - Is 1-2kpc thick - 30kpc in diameter

The Halo - Globular clusters (dense groups of relatively old stars) Spherically distributed along the galactic centre

Floating with the Globular Clusters

10kpc from nucleus in a spiral arm

In One of the spiral arms

In the Bulge

5kpc from nucleus in a spiral arm

Huge clouds of gas and dust that can block light

Not that!

Microwave EMR (wavelength =21cm, frequency = 1420mHz) can be seen by radio telescopes on Earth. This wavelength is given off by hydrogen.

Psychic Seeing

Doppler shifts in the wavelengths - We can work out how the galaxy is rotating

None of the above