The blue field entoptic phenomenon is an entoptic phenomenon characterized by the appearance of tiny bright dots nicknamed blue sky sprites moving quickly along squiggly lines in the visual field especially when looking into bright blue light such as the sky.
Bright blue light in the sky.
The dots are short lived visible for a second or less and traveling short distances along seemingly random curvy paths.
At that time the planet in question is as close as it gets just 0 4 au so bigger and because it s 100 illuminated from our point of view it s as bright as it can be in our night sky.
Normally this effect is very slight.
What was that weird blue glow in the sky.
At that time the blue tinted planet will be 4 light hours or 28 9 astronomical units from earth it will shine at a slightly brighter magnitude 7 8 and will be visible all night long in good.
That s why the sky appears blue.
Starlink satellites seen after the first launch in may 2019.