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Planetary nebulae are some of the most beautiful objects in the universe.
They  are formed when an intermediate mass star no longer has enough hydrogen to sustain nuclear fusion. The energy from nuclear fusion cannot counter gravitational forces and the star collapses.  This causes the core of the star to heat up, and the outer shell of the star is ejected. The exposed core emits extraordinarily intense ultraviolet radiation which ionises the expelled shell, causing it to emit light - primarily at the wavelengths of hydrogen alpha and oxygen III.

Click on each image for more details.
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NGC 1360

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EkGo 1
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WHTZ 1

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NGC 7139 revisited

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StDr 158

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DeHt 2
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M 97 with Halo

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M 57
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StDr 141

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Pre 71
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Abell 6

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Kn 121

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Abell 79

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Kn 19

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NGC 6751

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Abell 12

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IPHASX J022045.0+631134

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WeSb 2
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Dr 24

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Alv 3

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NGC 6826

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PaGo 2

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NGC 2371-2

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Abell 7

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HFG 1

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Kn 63

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MWP 1

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Jacoby 1

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Abell 36
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NGC 6543

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Jones 1
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Weinberger 1-10
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LoTr 5
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NGC 2346
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StDr 99

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Abell 56

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Abell 62

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Sh2-71
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Abell 71

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K1-6

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Abell 31

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Hu 5

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Abell 13

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StDr 140

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Fe 1
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Abell 66

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Abell 45.

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NGC 2610
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NGC 2022

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NGC 1501
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NGC 40
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NGC 2392

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Pa 28

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NGC 6905

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NGC 7139

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PaStDr 2 and Sh2-97

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PN G020.9-11.3
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Dr 26

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Kronberger 50

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HDW 3

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Abell 24

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Kn 61
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Soap Bubble
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NGC 7662
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LTNF 1
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Jones-Emberson 1
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StDr 164
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MoMiJi1
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M37 / IPHASX J055226.2+323724.

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SH2-176

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StDr 16
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We 3-1

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Abell 5

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K2-1
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Abell 30

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IC 289

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Dr 29

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PM1-333

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Kn26
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NGC 6058

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Abell 34

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NGC 4361
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FP J0711-2531

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HoCr 1
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H 3-75

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NGC 246

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Sh2-215

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PN G016.3 and M1-46

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EGB 6

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Abell 16

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IPHASX J015624.9+652830
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Abell 61
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Kn 24

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StDr 1

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M 76
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Abell 39
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M 97
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Sh2-188

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NGC 6302
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Ra 35

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WHTZ 3
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StDr 153

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Abell 78

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K1-16

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Jones-Emberson 1
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IC 1454

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Hu 2

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Abell 80
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PM1-320

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NGC 6772

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Abell 33

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NGC 3242

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Abell 50

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NGC 2440

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Abell 84

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NGC 7094

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NGC 7026

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NGC 7008
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PaGo 1

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StDr 45

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StDr 29

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HDW 2
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Dr 27

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Sh1-89

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YM 16
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NGC 7009
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NGC 1514
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M 57

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NGC 7293
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