A move can be into an orbit.Logical formLearned from5 sentences. An orbit may vary in altitude.Logical formLearned from5 sentences. A spacecraft may undergo an (orbit maintenance operation).Logical formLearned from5 sentences. Some (space stations) can be in orbit.Logical formLearned from5 sentences. A countdown may begin toward orbit.Logical formLearned from5 sentences. Part of a sphere of influence may slip into an orbit.Logical formLearned from5 sentences. Two-thirds may pertain-to an orbit.Logical formLearned from5 sentences. Orbits can be erratic.Logical formLearned from5 sentences. Some satellites may enter orbits.Logical formLearned from4 sentences. An orbit can be terrestrial.Logical formLearned from4 sentences. A period can be constituted-of-or-filled-with (orbit testing).Logical formLearned from4 sentences. A (transfer orbit) may undergo an entrance.Logical formLearned from4 sentences. A satellite may reach an entrance of a (transfer orbit).Logical formLearned from4 sentences. A probe may move on an orbit.Logical formLearned from4 sentences. A station can be in orbit.Logical formLearned from4 sentences.