Observations of the BlueWalker 3 prototype satellite show it is one of the brightest objects in the night sky, outshining all but the brightest stars. Astronomers have raised concerns that without mitigation, groups of large satellites could disrupt our ability to observe the stars from Earth and perform radio astronomy. Several companies are planning 'constellations' of satellites – groups of potentially hundreds of satellites that can deliver mobile or broadband services anywhere in the world. However, these satellites need to be in 'low-Earth' orbit and can be relatively large, so their potential to disrupt night-sky observations is a concern.

https://www.miragenews.com/huge-low-orbit-satellites-may-disturb-astronomy-1095646/

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