Thermosphere starts at around 90 km to 1000 km above the sea level. It is present between Mesosphere and Exosphere, The temperature climbs sharply from lower to higher and it get impacted by the solar temperature heavily. In the lower level of thermosphere almost till 500 km resides the ionization/ ionosphere. This area is ionized by solar activities and the cause of Aurora.
So if the rocket launched the height of 210 km, so it has reached the thermosphere and might also touched the ionosphere and aurora
I believe it’s the sun As the sun gives nutrients to the plant Plant gets satin by animal Animal gets eaten by animal and so on and the nutrients would be passed on
