Am 16.03.2017 um 08:36 schrieb Thomas de Groot:
> On 15-3-2017 19:09, clipka wrote:
>> Am 15.03.2017 um 13:23 schrieb Thomas de Groot:
>>
>>> Yes indeed. I intend to add some brighter stars. Otherwise, the idea is
>>> that we are in a part of the galaxy much brighter than our own and that
>>> star clusters are also visible in daylight, like in this image. The
>>> 'moon' is intended to be in a much earlier phase of development with
>>> lava fields and impacts highlighted.
>>
>> Fun fact: Contrary to popular belief, celestial structures whose
>> apparent size exceeds the resolution of an image sensor (eye, camera or
>> whatever) do /not/ exhibit an increase in "pixel brightness" as you get
>> closer(*). They just exhibit an increase in apparent size.
>>
>> (*Unless you traverse dust clouds as you approach.)
>>
> 
> Hmmm... that makes sense somehow. So, I should correct what I wrote
> earlier about a 'brighter' part of the galaxy. Still, I suppose that
> with a sky filled with star clusters rather than individual stars, those
> clusters could be visible by day. Like some comets for instance do.

Certainly not in the way you've depicted it: The average brightness of
the [night] sky shouldn't exceed that of the galaxy's brightest place,
the core.

If the stars in the core were arranged into hyper-dense clusters (which
they most likely aren't, since the core is such a busy place that the
clusters would keep ripping each other apart), then you might see /some/
isolated blotches of light at daytime, being the few clusters nearby
enough to cover a noticeable area of the sky while still being far away
enough to not being visible as individual stars.

Also, presuming the planet's sun is part of a cluster itself, the sky
would be riddled day and night with other stars from the "home cluster",
some of which would be much closer than our nearest neighbors, and thus
also much brighter, possibly even so bright as to drown out the still
comparatively dim blotches that are the neighboring clusters.


For giggles, you might want to try some calculations to see how dense a
star cluster would have to be in order for it to have a per-area
brightness comparative to that of the moon, which is probably a good
benchmark for the minimum brightness of an object to be seen at daytime.

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