had been plunging
-había estado sumergiendo
Past perfect progressiveconjugation ofplunge.There are other translations for this conjugation.

plunge

Planet X had been plunging toward the Sun, rapidly entering the solar system in the short years prior to 2003 at a speed close to the speed of light.
El Planeta X había estado entrando hacia interior del sistema solar en dirección al Sol, ingresando rápidamente al sistema solar en los años previos a 2003 y a una velocidad cercana a la velocidad de la luz.
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