Simplify the following text for a Grade 3 native English-speaking person.
Original: Romulus , the outermost moon , would be about 0.89 Â across , slightly bigger than the closer but smaller Remus , which would be about 0.78 Â across .
Simplified: Romulus , the farthest moon , would be about 0.89 Â across , a bit bigger than the closer but smaller Remus , which would be about 0.78 Â across .