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Black Holes
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Slide 23

Contains large amounts of gas and dust  always producing new stars

Contains large amounts of gas and dust always producing new stars

Slide 24

Black Holes

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Black Holes

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Irregular

Irregular

No specific shape

Contains large amounts of gas and dust

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Small and faint therefore hard to see

Small and faint therefore hard to see

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Irregular

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Quasars

Quasars

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Quasars

Quasars

Small, powerful source of energy thought to be cores of distant spiral galaxies

Slide 31

They emit radio waves and bright light

They emit radio waves and bright light

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