Breakdown of Спутник пролетел только треть орбиты.
только
only
треть
third (fraction, one third)
пролететь
to fly by (pf)
орбита
orbit
Questions & Answers about Спутник пролетел только треть орбиты.
How does the word треть work here, and what case is it in?
Треть is a feminine noun meaning "a third." Like other fractions in Russian (such as четверть for "a quarter" or половина for "a half"), it acts as a noun rather than a standard number. It is the direct object of the verb, so it is in the accusative case. Because it is a feminine 3rd-declension noun ending in a soft sign, its accusative form looks exactly the same as the nominative.
Why is орбиты in the genitive case?
It is governed by the fraction noun треть. Just like in English where we say "a third of the orbit," Russian uses the genitive case to link these two nouns, indicating the whole from which the fraction is taken.
What nuance does the prefix про- add to the verb in пролетел?
With verbs of motion, the prefix про- often indicates covering a specific distance, passing through a space, or moving past something. Here, пролетел emphasizes the completion of traveling a specific measured segment of the journey (a third of the orbit) rather than just the general action of flying.
Could we put только before the verb instead of before треть?