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Assuming "nebulae" is a general topic | Use as a class of astronomical objects or a word instead
Astronomy
Nebulae

Emission Nebulae

compute location and get properties of a nebula

Orion Nebula

NGC 3372

compare nebulae

M43 vs IC 1871

get a property of a nebula

apparent magnitude of the Crab Nebula

locate a nebula at a specified time

IC 5070 at 3am on 18 May 2012

Planetary Nebulae

compute location and get properties of a planetary nebula

Ring Nebula

NGC 2242

compare planetary nebulae

NGC 246, IC 4732, M76

get a property of a planetary nebula

NGC 7662 apparent magnitude

locate a planetary nebula at a specified time

Helix Nebula on Sep 22, 1998 at 10:35pm

Bright H II Regions

compute location and get properties of a bright H II region

NGC 604

compare H II regions

IC 140 vs IC 142

locate a bright H II region at a specified time

NGC 5906 at 7:00pm on Jan 12, 1988

 
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