About the space pollution caused by the #SpaceX satellites and the meaning for ground based astronomical observations. At the moment there are 1500 #Starlink satellites, but SpaceX was allowed to increase this number by a factor of 10.

ArsTechnica wrote:

Because these tracks are small and software already identifies and handles them, they don't have much of an effect on observations. The researchers estimate that, at present, there's only a 0.04 percent chance that a rare event will be missed because it coincides with a track. But because the problem is most acute in twilight observations, it's more likely to impact searches for objects within the Solar System. This would include comets and asteroids—including asteroids that originated around other stars.

But again, the problem is likely to get worse. SpaceX already has approval to increase the number of Starlink satellites to well over 10,000; the authors estimate that at 10,000, every image at twilight will likely contain a Starlink track. SpaceX has indicated it would eventually like to boost the numbers to over 40,000 satellites, at which point all twilight images are likely to have four tracks.