The time of revolving depends on the distance so that the more distant planets take longer to get round, and as well as that they move more slowly, which makes them take even longer.
The record is held by the dwarf planet Sedna, which takes 11,400 years for one revolution of its highly elliptical orbit.
He discovered that the planets revolved around the sun instead of the planets & the sun revolving around Earth.
The last time the planets aligned in a straight line while revolving around the sun was on March 20, 1345. This phenomenon, known as a planetary alignment, occurs when several planets appear in a line relative to the sun from the perspective of Earth.
Some planets take longer to orbit the sun because they are farther away giving them a longer path to travel.
There are more than 300 known stars with known planets, and the list gets longer all the time.
If sun's gravity suddenly disappears then the planets will stop to revolve around the sun after some time and this duration is equal to the time taken by the light to reach from sun to other planets. For e.g. Time taken by earth to stop revolving and flying off in any direction = Time taken by light to earth from sun = 8 min. 20 seconds Also, planets will start to fly in any direction and they may collapse and in simple words: Solar system will collapse and life will disappear on earth.
The Moon takes longer. The Earth spins once in 23 hours 56 minutes, while the Moon spins once in about 27 days.
We do not know as nobody was arround at the time to herd them and record how to do it.
The outer planets all rotate faster than the inner planets. Each of them has a rotational period shorter than an Earth day. All of the inner planets have rotational periods longer than one Earth day. The outer planets are mostly made up of hydrogen, helim, and ice, and they are much larger than the inner planets which are mostly iron and various types of rock.
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.
Because if they were ever going to collide they would have done it at some time in the last 3.5 billion years. Each planet has its own stable orbit which takes it round the Sun regularly at a fixed range of distances that does not overlap with other planets. The planets are understood to follow Kepler's laws in elliptical orbits, under the force of the Sun's gravity.
When ever they get arround to working on it. IT WILL BE A LONG TIME.
The outer planets take much more time and also travel longer to complete a whole orbit around the Sun, than the inner ones.