were sifting
-estuviste tamizando
Past progressiveconjugation ofsift.There are other translations for this conjugation.

sift

A few years ago, Planet Hunters were sifting through data looking for transits, and they spotted a mysterious signal coming from the star KIC 8462852.
Hace unos años los cazadores de planetas depurando datos en busca de tránsitos, vieron a una misteriosa señal procedente de la estrella KIC 8462852.
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