Answer:
1.63 
Explanation:
The equation 
would be used where:
g = acceleration due to gravity
G = universal gravitational constant (6.67408 × 
)
M = mass
R = radius.
assuming the values following both 10s of the mass and radius are their exponents, which is a little confusing, the values given would simply be substituted.
Anyone can correct me if I'm wrong.
Explanation:
because the moon has less mass than earth, the force due to gravity at the lunar surface is only about 1/6 that on earthso,the weight of a body on earth is 6×5N =30N
Harder. Not compressible(unless using an extremely strong force). Non-metal have more of a chance of breaking than metals.
Astronomers give stars names so that they're able to identify and keep track of them more easily.
C. A hypothesis :) hope this helped
