The two factors that combine to keep the planets in orbit are- A. gravity and orbital speed
B. orbital speed and mass
C. mass and inertia
D. gravity and inertia

D. Gravity and inertia

When it happens orbital motion occurs

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .