Would light reach the surface of a planet with a 1 million kilometers thick earth like atmosphere?

So I have a planet that the size of our solar system(magic/white hole/whatever keeps the planet on 1G despite having the weight of a neutron star). So the planet is very earthlike in terms of soil, plants, animals, air etc. But my guess was that the planet could not have a ~20km atmosphere like our earth does so it has to be considerably bigger or could this planet also only have a 20km atmosphere?

Now I did some calculations on how big the atmosphere would be if I increased it 1:1 and came out to some crazy numbers like 400 million km. So I decided to settle it down at 2 million KM.

But this got me thinking if I have a distance of 2 million kilometers filled with air would light from the sun (the sun is orbiting the planet) even get to the surface? Would increasing the size or power output of the sun make this possible?

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Would light reach the surface of a planet with a 1 million kilometers thick earth like atmosphere?

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