To be honest I’m not sure what those objects are, could be small fragment of dust being illuminated by sunlight or other satelites with sunlight reflecting off them. Whatever they are they are being illuminated by the sun. Given what the camera is exposing for its not stars, they would be too dim to show up. Go out during the day and try to photograph the stars, they are still there, not gone away, just too dim to see! A bit like you really dim!
You flat earthers must really hate this stuff as it kills stone dead your prehistoric beliefs.
Aww, scared?
"I don't know, but you're wrong! you've got to be! WAAAAA MOMMY!!"
As seen from Earth, the overall quality of the light from the Sun - that is to say its intensity, wavelength, polarisation etc - is greatly reduced. No atmosphere would mean no scattering and no absorption takes place. This is why the Sun would appear much brighter if you observed it from orbit. And therefore why objects appear much brighter in space.
However extremely bright and small objects do not agree with the type of circuitry we use in digital imaging. The relatively large and localised electrical charge they create will interact (i.e. interfere) with neighbouring pixels to create common artefacts. A simple example of this would be to make an object appear larger than it actually is by occupying two pixels instead of one. To some degree these artefacts can be abated by reducing the quality of the captured image - intensity, contrast, wavelength weighting/filtering etc. A simple computer monitor should be able to demonstrate many of these counteracts.
If we now consider that different objects emit and reflect different colours, then our cameras and telescopes would need to be incredibly sophisticated to capture every aspect of the light that is incident upon them. This is why ground and space based observations are typically limited in their detection range - Radio, Visible, UV, X-ray etc - our technology isn't good enough to coherently capture all of that energy. This is also why there exists the argument of celluloid versus digital in modern cinema. A digital camera is sensitive to light at the electronic level. The chemical treatment of film is sensitive to light at the photonic level.
Composite images are created by overlaying different captured wavelengths to give a more complete picture. A common usage of this would be to determine if a sudden increase in emissions in one part of the EM Spectrum was accompanied by emissions in another part. Such events can provide insight into the composition, structure and behaviour of the star.