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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 6765

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PHR J0800-1635

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Abell 72
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MWP 1 with Alves 1

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Ek 7

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Kn 45
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FP 1755-1301

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PN G011.8+03.7
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PaGo 2
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Fr 2-41

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PN G136.7+61.9
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StDr 13
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Abell 29

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HDW 6

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We 1-3

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Sh2-78 aka CTSS-3

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Abell 82

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IC 1295

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Abell 59
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Kohoutek 1-17
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We 3-1

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IPHASX J015624.9+652830

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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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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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PN G227.1+00.5

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Kn 59

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Ek 10

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Ek 5

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PN G015.5+02.8

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PN G006.5+08.7 
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PaMor 1

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Kn 132
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StDr 13 with StDr 155

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FP J0721+0133

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Riddle  1

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Ra 54
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Kn 130
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KK 26
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MoMi 6 and Ou 6

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Sh2-165 and LDû 13
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Kronberger 43 and Pa J1940.3+1855

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Patchick 4
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PuWe 1
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Abell 22
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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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PHR J0743-1951 

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StDr 35 and WeSb 1

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We 2-5
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Ek 8

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NGC 6842

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PN G020.9-11.3

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 FP J1824-0319
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StDr 81

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Fr 2-25
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PN G216.0+07.4

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StDr 155
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StDr 33

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NGC 2438
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LoTr 1

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Kn 131
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EkGo 3 and EkGo 4

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IPHASX J193718.6+202102
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Kronberger 9

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Si 1-2
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FP J1912-0331

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Hu 7
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Abell 39

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StDr 163

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Abell 34
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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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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

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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Abell 61
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Kn 24

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StDr 1

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M 76
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M 97
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Sh2-188

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CaVa 1
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Abell 34

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Sh2-176 with Elmore 3

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Ek 9
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Alves 6

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IPHASX J193009.3+192129

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IPHASX J192347.8+143642
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PaEl 2
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PaEl 1
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Abell 20
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Abell 28

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Ra 30

Picture

IPHASX J055711
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StDr 11

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M 2-55

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Abell 74
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Ou3, Cop 2, PNG 059.3+01.0

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Jacoby 1

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SkAc 1
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StDr 161

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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

Picture
NGC 7293
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