#2783: Ruling Out explain

[Cueball is talking to Megan.]

Cueball: So far our astronomy group has published studies ruling out the existence of Earthlike stars, exoplanets in our solar system, habitable-zone quasars, stars with subsurface oceans, and tectonically active black holes.

[Caption below the panel:]

Science got way easier when we realized you were allowed to do studies just to rule stuff out.