I know that the magnitude scale is inverted, smaller the number, the brighter the object.

When I throw these examples of luminosity (4475, 3549, 2409) from my screenshots into this calculator it gives me these magnitudes: -4.39, -4.135, -3.715. None of these are yellow supergiants, the least ...

I am not sure where would it be appropriate to post it, so here it goes.

I have version 0.980E.

So the thing is, that luminosity of procedural supergiants does not correlate with this graph.

https://upload.wikimedia.org/wikipedia/commons/6/6b/HRDiagram.png

In other words, I think that ...

https://i.imgur.com/jVY3RsI.jpg
This here is the second ever binary stellar remnant I have found so far. It is a neutron star and an accreting white dwarf. I assume that binary dead stars are rare in SE, and I would be interested in seeing or finding other multiple combinations of WDs. Qs an Xs ...

https://i.imgur.com/VeautfS.jpg

https://i.imgur.com/G8lCuPZ.jpg
Almost breathable. SO 2 seems to be tolerable, but the hydrogen sulfide would stink. The party pooper here is CO 2 , and the temperature of course.

https://i.imgur.com/rBxHedo.jpg
This one is not breathable, but it is a curious ...

https://i.imgur.com/twgzFyV.jpg
I've been exploring the Messier 71 cluster in the Sagitta constellation.

https://i.imgur.com/csmXaWE.jpg
From Earth. See the Coathanger, on the right.

https://i.imgur.com/ljA8RFb.jpg
Red hypergiant transited by a parent planet of a moon. (RSC 8474-314-0-0-16 ...

24125 Under a truly dark sky and without Venus or the Moon in the sky to provide illumination, the ground looks black, like absolutely black. You can't even see your hand in front of your face.
I dare to disagree. :) I remember participating on a Messier marathon* once and seeing the meadow and ...

Not only is the Moon illuminated from way too south, which would never happen, it is also about 6 times bigger than the Pleiades in the lower left corner. Angular diameter of the Moon is less than that of the Pleiades. It is also way too far from the ecliptic.

Just something that itched my eyes.

the apparent magnitude of the Moon becomes about magnitude +10.8

Not good. Thanks for the calculation.

24108 If the atmosphere of Venus was completely cloud-free, would we even be able to see anything from the surface, like Sun, planets, and stars?
This is a very interesting question! I assume you mean if the atmosphere was STILL CO 2 rich and capping at a pressure of 93 bar , with its ...

24083 Temperature and Pressure are interrelated aspects here, at least inversely. Doubling the atmospheric pressure will double the scattering of light, whereas doubling the temperature doubles the brightness (reducing scattering), as an example. On Venus, we can see this happening vividly, where ...

24083 You mentioned sulfur, and this is a good example for the scattering in action. At 1 atm pressure, blue light is cut to below human eye visibility in less than half a meter, and the red is gone in fifty meters. Hence planets with a predominantly sulfuric atmosphere would have a dim murky ...

That was an enlightening analysis. :)

To divert the discussion, I have two sets of questions. One about the color of planetary atmospheres and one about eclipses, but they are related.

My assumption is, that the color of an atmosphere is determined by it's composition, density and non-gaseous ...

Hello America.

I would very much like to see variable stars. Periodic change of their radius and temperature (therefore, luminosity) might be a good start. (Which would require periodic change of corona radius, surface features and many other parameters, when I think about it).

Different kinds of variable stars ...

Neptune-sized moons before the first candidate (Kepler-1625b I).