Isaac Newton was born the year Galileo died. In Newton's time, everything known about planetary motion could be summarized by Kepler's three laws of planetary motion. The first law states that planets move around the sun in elliptical orbits. The second states
that a planet moves out at equal areas in equal times. According to the third law, the square of the orbital period is proportional to
the cube of the distance to the sun. The laws describe what happens without explaining why. Newton believed that the bodies in
space behaved like bodies on Earth: they followed the same laws of motion. He hypothesized that some force acted on the planets
and moons, keeping them in orbit so they did not move in a straight line. Newton proposed that was the force that kept
the planets in their elliptical orbits.
A)
mass
B)
gravity
C)
electrostaics
D)
centripetal force

B. Gravity

Explanation:

Newton proposed that the force that kept planets orbiting around the sun in elliptical orbits was gravity. Much like the moon is pulled by earth's gravity, Newton proposed that the planets orbit the sun because they are being pulled in by the sun's gravity.

Being closer to the sun means that the gravity is stronger. It is for this reason that planets closer to the sun go around faster than than those further off and complete their orbits faster.

Gravity

Explanation:

a characteristic is a deep cut in the earth or left over rock aka till.  

explanation:

on august 6, 1945, just days after the potsdam conference ended, the u.s. bomber enola gay dropped the uranium bomb known as “little boy” on the japanese city of hiroshima. despite its devastating effects, japan didn't offer unconditional surrender right away, as the united states had hoped.