Answer:
los astronomos acaban de detectar una nueva constelacion
Explanation:
the only thing that changes is the verb acabar. since the sentence started with LOS or LAS then we automatically know it's plural and if u follow the rule of like
yo: acab-o
tu: acab-as
el/ella: acab-a
ellos/ellas: acab-an
nosotros: acab-amos
vosotros: acab-ais
Los/Las belongs to ellos/ellas
