What grade does 5th graders be in?

Abdid is an astronomer who has been observing objects that orbit the sun in the asteroid belt. he finds a previously undiscovered round, rocky object that is not similar in shape to the rest of the asteroids. what has abdid most likely found?

Ineed an answer for this one (number 8)

How was the structure of american society different in 1848 than it has been in 1800