The sun keeps all of the planets orbiting it because

the law of universal gravitation states that an increase in mass causes an increase in gravitational force
the law of ellipses states that the planets orbit the sun in circular patterns
the law of harmonies states that the motion of the planets will not stop unless an outside force is applied

a) the law of universal gravitation states that an increase in mass causes an increase in gravitational force

hope this helps!

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19