Simplify the following text for a Grade 10 native English-speaking person.
Original: The bulk of the asteroids discovered by Wolf around this date were named for characters in operas , but if this name was also drawn from such a source , no explanation has been recorded .
Simplified: Most of the asteroids found by Wolf around this date were named for characters in operas , but if this name was also drawn from such a source , no explanation has been recorded .