Good Evening.

Can anyone answer a question i have about amateur rockets. Iv seen many videos on you tube and they all seem to be at around 120,000 ft max altitude with the horizon at eye level. my question is why cant amateur rockets go any higher? and if they could go higher at what point to globe earthers believe the horizon will start to fall and the horizon look curved?

Any help with this question much appreciated. i did try to look online for maximum altitude for amateur rockets but can not find an answer as to why they are unable to go any higher.

Regards..

J