1651
The clouds of captured hydrogen and helium gas contracted , spun up , flattened , and deposited gas onto the surface of each giant protoplanet , while solid bodies within that disk accreted into the giant planet 's regular moons .
 astronomical object: protoplanet
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 astronomical object: protoplanet