Quote:
Originally Posted by ausastronomer
You hit the nail on the head.
Even the largest of planetary Nebula only span about ~100 light years or so. I think the Rosette is one of the largest at ~130 light years. The Helix Nebula in Aquarius (NGC 7293) is one of the larger planetary nebula by apparent size at ~25' but it only spans 2.5 light years and is 650 light years distant.
The Tarantula Nebula (NGC 2070) in the LMC spans > 900 light years but because of the distance ~200,000 light years its apparent size is 40' x 25'. A really big planetary like the Rosette would be just off stellar at those distances, but anything much smaller would be stellar.
Cheers
John B
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Hi John, nice to hear from you! I am currently working through your legendary BAM600 list
