LEO ranges in altitude from 100 miles (160 kilometers ... In the short-term, lower atmospheric density at high altitudes isn’t a huge concern. But in the long-term, the effect can significantly ...

Atmospheric pressure decreases exponentially with altitude, causing a drop in blood oxygen saturation level to around 90% (73 hPa) in healthy passengers at cruising altitude, explain the researchers.

This spike in atmospheric density is not a faint signal. In geomagnetic storms, the thermosphere can get hot and bloated, doubling or tripling mass density at altitude 400 km within hours.

Such decreased density will reduce drag on objects orbiting in the upper atmosphere, between 90 and 500 km altitude, extending the lifetime of space debris and elevating the risk of collisions ...