1. What's in our galaxy?

2. Emission Nebulae Spectra consist of emission lines
Are hot, ionised hydrogen plasma (plus a few other elements)
where stars are born

3. Star Formation in Emission Nebulae

4. Dark Nebulae Cool molecular gas from which stars form
Absorb (redden) the light from background stars
Not a “hole” in space

5. Dark Nebulae
in Emission Nebula

7. Reflection Nebulae – Found around hot O/B stars, scatter the light from the stars (no intrinsic emission)

8. Open Clusters Loose collection of stars
Gravitationally bound – all of the stars orbit each other – they are in the same region of space and were born in the same nebula

9. Globular Clusters Old, and extremely dense spherical
grouping of stars. Found orbiting outside our galaxy.

10. Planetary Nebulae Named for their disc-like appearance
They are the outer envelopes from the collapse of solar mass giant stars being ejected into space
Normally spherical
Contain a white
dwarf star at their
centre

12. Supernova Remnants Ejecta from the explosion of a massive star
Crab nebula remnant is only 1000 years old
At it's centre is a pulsar

13. Veil nebula is 100,000 years old