Answer:
can u send a picture to identify it
Explanation:
sorry I just need point:/
The Electromagnetic spectrum.
Yes because it helps them locate their position and direction
Answer:
Acceleration due to gravity, 
Explanation:
It is given that,
Mass of Pluto, 
Distance between Neptune and Pluto, 
The force of gravity is balanced by the gravitational force between Neptune and Pluto. It is given by :



So, the acceleration due to gravity at Neptune due to Pluto is
. Hence, this is the required solution.