no they do not
A planet has an elliptical shaped orbit. It orbits with a constant angular speed, but a varying linear speed.
It travels around the sun in the same direction as the other planets. This is considered the "positive" direction.
For the same reason that it would take longer to run around your block than to run around your yard. The further planets have a further distance to travel to make one revolution around the sun.
No
Gamma rays travel exactly the speed of light because gamma rays are light
The outer planets revolve about the same speed they just have to travel a much longer distance so it takes longer.
No, all of the planets have different orbital speeds, dependant on many factors including the gravitational forces experienced by the particular planet.
A planet has an elliptical shaped orbit. It orbits with a constant angular speed, but a varying linear speed.
The gravity is greater the nearer to Earth you go. The same is true for all planets.
It travels around the sun in the same direction as the other planets. This is considered the "positive" direction.
All light travel at the same speed.
For the same reason that it would take longer to run around your block than to run around your yard. The further planets have a further distance to travel to make one revolution around the sun.
The one that is closer will move at a higher speed. The same happens, for example, with planets revolving around the Sun - the planets closer to the Sun move faster.
No
No.
Gamma rays travel exactly the speed of light because gamma rays are light
They travel faster