I want to make one as a volumetric atmosphere, but I have no idea how. Any suggestions? I’m using Blender 4.5.2 for this.
Above is an example of the Earth’s atmosphere in Gravity (2013). These are very distinctive for their smooth atmosphere that kind of stretches into a smooth gradient falloff. The smooth gradient falloff atmosphere is smooth, but a lot. Cycles can do that, while EEVEE can’t do that.
Start by showing images of and describing what you’ve tried so far.
Say something else?
This isn’t Google, when you ask questions here people are going to ask follow-up questions to accurately help. If you don’t want that, there’s plenty of chatbots that will happily give you a probably wrong answer but won’t ask follow-up questions
Welcome 
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when you
but then also say
you might try the the awesome forum search function (top right; 
–icon).. and so find:
..because otherwise you may build up a bad first impression.
Also when already referenceing something like this (like also the second link) users see that you are really interested in this and might be even more eager to help.
Doing some little research might even be answereing some questions in the future already and so you can asked exactly that part you couldn’t understand yet or which may have changed because of newer blender versions doing it slighly different.
Think about it..
You can begin by using cycles rendering engine if your PC is decent enough and isn’t outdated, my blend file project has an accurate volumetric atmosphere scattering, the falloff is also physically accurate.
Earth’s atmosphere isn’t like that, technically the atmosphere density gets thinner exponentially starting from 0 to 100 km altitudes. So it has more of an exponential falloff, feel free to experiment with my blend file project. Here is the result i created in Blender. https://drive.google.com/drive/folders/1hw3g-t77XZJDeAliqSsq8WW3EfLdaYjO?usp=sharing
Note that the starry background i added in composite tab, because i had enabled transparent background in Film settings.
Here’s my live preview, i’d recommended you disable the clouds mesh and only enable it when you want to actually render it, because it’s the reason why my performance is so slow.
