Because of the stronger gravitational force from the Sun, you need greater "centrifugal force" to stay in orbit and thus a greater velocity.
According to Kepler's laws of planetary motion, the nearer a planet is to the Sun, the faster it travels in its orbit.
No, it is the sun's gravity that affects the planets revolutions. The planet's distance from the sun is also very important in the time it takes to revolve around the sun.
The very short answer to that is Gravity Im affraid.
The planet always moved very fast. But it's fastest velocity would be attained at it's nearest approach to the sun.
very fast 300mph
very fast. about 100 microseconds.
There would be sunlight as long as we are close enough to our sun. If our planet escaped from the suns gravitational pull and disappeared off into space away from the sun then it would get very dark. This is unlikely to happen though.
Venus
The planet you are describing is Mercury. It is the closest planet to the Sun, characterized by its small size, heavily cratered surface, and extreme temperatures. Mercury has no natural moons and completes its orbit around the Sun in just about 88 Earth days, making it the fastest orbiting planet in our solar system.
neptune is the eighth planet from the sun . Comment: You can get as close as you like, but you would need a very good spacecraft and it would take years to get there.
mecur
365.243 days -- if you're talking about days it takes for the earth to revolve around the sun. For any planet to rotate around its own axis takes one day -- one of that planet's days. The moon, for instance, is tide-locked to the Earth, so one lunar day is very close to the 28-Earth-day orbital period.