Orbital spaceflight
Orbital spaceflight (kapena yoyenda mozungulira) ndiwuluka mumlengalenga momwe ndege yoyika ndege imayikidwa pamsewu pomwe imatha kukhala m'malo pang'ono. Kuti muchite izi padziko lonse lapansi, ziyenera kukhala pamsewu waulere womwe umakhala pamwamba perigee (kutalika kwambiri) pafupi ma 80 kilomita (50 mi); Awa ndi malire amlengalenga malinga ndi NASA, US Air Force ndi FAA. Kuti mukhalebe mumsewu pamtundawu pamafunika liwiro lozungulira ~ 7.8 km / s. Kuthamanga kwa Orbital kumachedwa pang'onopang'ono mozungulira, koma kuti mufike pamafunika delta-v yayikulu. Fédération Aéronautique Internationale yakhazikitsa mzere wa Kármán pamtunda wa 100 km (62 mi) ngati tanthauzo logwira ntchito pamalire pakati pa aeronautics ndi astronautics. Izi zimagwiritsidwa ntchito chifukwa pamtunda wa pafupifupi 100 km (62 mi), monga Theodore von Kármán adawerengera, galimoto imayenera kuyenda mwachangu kuposa liwiro la orbital kuti ikweze okwanira mlengalenga mlengalenga kuti izitha kudzisamalira.

Chifukwa chakokoka kwamlengalenga, malo otsika kwambiri pomwe chinthu chozungulira mozungulira chimatha kumaliza kusintha kamodzi popanda kuyendetsedwa ndi pafupifupi ma kilomita 150 (93 mi).

Mawu oti "ndege yozungulira yozungulira" imagwiritsidwa ntchito kusiyanitsa ndi kuwuluka kwakanthawi kochepa, komwe ndi ndege komwe woponyera ndege amafika mlengalenga, koma wothamangayo amakhala wotsika kwambiri.

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