Not that

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

Andromeda Galaxy M31

Triangulum Galaxy M33

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

Not that

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

Large Milky band stretching across the sky

A giant disk shaped Catherine Wheel rotating around a central bulge

Not that

In the Winter Triangle

The galactic centre lies in Sagittarius

In the Summer Triangle

In a line from Cassiopeia to Cygnus

A bulge surrounding the nucleus (black hole)

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

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

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

5kpc from nucleus in a spiral arm

10kpc from nucleus in a spiral arm

Floating with the Globular Clusters

In the Bulge

In One of the spiral arms

Huge clouds of gas and dust that can block light

Not that!

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

Psychic Seeing

None of the above

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