estaban mapeando
-they/you were mapping
Imperfect progressiveellos/ellas/ustedesconjugation ofmapear.

mapear

Los investigadores encontraron el anillo inesperadamente cuando estaban mapeando la distribución de materia oscura dentro del cúmulo de galaxias Cl 0024+17 (ZwCl 0024+1652), localizado a 5.000 millones de años-luz de la Tierra.
The researchers spotted the ring unexpectedly while they were mapping the distribution of dark matter within the galaxy cluster Cl 0024+17 (ZwCl 0024+1652), located 5 billion light-years from Earth.
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