What's in our galaxy?.

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Presentation transcript:

What's in our galaxy?

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

Star Formation in Emission Nebulae

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

Dark Nebulae in Emission Nebula

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

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

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

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

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

Veil nebula is 100,000 years old

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