I would say that the answer would be MASS.
Answer:
You didn't give the information needed for the answer bud
Explanation:
Answer:
d
a balanced force acted on it and propelled it to 4,000 km/hr
Explanation:
For the neutrons star which is moving in outer space at 4,000 km/hr, it could only be possible as a result of the balanced force which had already acted on it. <em>This is based on newton's law of motion which states that 'To every action, there is equal and opposite reaction'. </em>
Earths atmosphere, Temperature, Plant life and Oxygen I guess
Humans can not see any of the above with their eyes