Simplify the following text for a Grade 8 native English-speaking person.
Original: However , since objects in microgravity still retain their mass and inertia , an astronaut must exert ten times as much force to accelerate a 10kilogram object at the same rate as a 1kilogram object .
Simplified: However , the objects still have their mass and inertia . Astronaut must use ten times as much force to accelerate a ten-kilogram object at the same rate as a one-kilogram object .