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Abell 21 Abell 21 is a planetary nebula because the first of the types observed looked like a planet. Although the observer knew full well that they were not planets because they did not move against the background stars. A planetary nebula is what happens to a star similar to one the size of the Sun or smaller at the end of it's life when it puffs out its outer atmosphere. Link-words: Abell 21 Seestar

Abell 21

Abell 21 is a planetary nebula because the first of the types observed looked like a planet. Although the observer knew full well that they were not planets because they did not move against the background stars.
A planetary nebula is what happens to a star similar to one the size of the Sun or smaller at the end of it's life when it puffs out its outer atmosphere.
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File information
Filename:Abell_21_1265x10sec_T11C_2024_11_28_Final.png
Album name:Whitters / Nebulae
Link-words:Abell / 21 / Seestar
Image date, time and location:21/11/2024 3h 30m 50s - 1265 x 10s Mileaway Observatory East Sussex
Telescope aperture and focal ratio:Seestar S50
Camera and filters used:Seestar S50
Processing applied:Images with a Seestar S50 Aligned and stacked in Siril, then processed in Pixinsight using Graxpert, NoiseXterminator, BlurXterminator and Curves
Filesize:2536 KiB
Date added:Dec 13, 2024
Dimensions:834 x 1431 pixels
Displayed:2 times
URL:http://gallery.orpington-astronomy.org.uk/displayimage-2950-_Abell_21_.html
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