The length of a planets "day" is another way of saying the amount of time it takes a planet to rotate once on it's axis. Each planet does this in it's own good time. There are some basic principles behind it, but overall, there is no "one answer" we can pinpoint as to why planets rotate at different speeds. They simply do.
Because some planets take longer to do a full rotation (spin round).
Edit: More accurately, the magnetic field surrounding them and the sun differs based on distance. Mercury, the planet closest to the sun, has a day of some 12 hours. Pluto, the farthest, has a day of over 200 Earth years.
Because they turn faster on their axis than the Earth does.
All planets spin at different speeds, related to their mass.
Not all planets rotate around their axis at the same rate. The slower the rotation, the longer their day.
Because the nearer the sun they are, the shorter the light is around
Some planets have longer/shorter days because they are further away from the sun so they have more or less time to orbit around it.
Because they all rotate and there is nothing to make them all rotate at the same speed. The rotation speeds are all more or less random.
It depends on how fast the axis rotates
because your mom is stupid
All of them!
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.
None of the four outer planets, they all have rotational periods shorter than 24 hours. The dwarf planet Pluto has a rotational period of 6.4 days though.
Planets closer to the sun than Earth orbit the sun in less than one year (Mercury and Venus), while planets further out from the sun than Earth take longer than a year (Mars, Jupiter, Saturn, Uranus and Neptune). The further out you go, the longer it takes to orbit the sun.
That's because Jupiter rotates much more quickly than Earth. (Astronomers aren't sure exactly why that happens.)
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The earth spins faster than the planets Mercury and Venus, meaning that its apparent days are shorter (24 hours).
All of them!
177 days shorter on mercury than the earth
pluto
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.
Shorter. Mercury has a shorter orbit than earth and 1 day in mercury = 59 days on Earth. 1 year on mercury= 88 days on earth.
A year on Earth is longer than it is on two other planets, and shorter than it is on the remaining five. The farther a planet is from the sun, the longer its year is.
Earth rotates faster than Venus by about 141 days.
The inner, or Terrestrial planets are very small in comparison to the outer, or Jovian planets. The smallest Jovian planet, Uranus, is 14.5 times larger than the largest Terrestrial planet, Earth.
None of the four outer planets, they all have rotational periods shorter than 24 hours. The dwarf planet Pluto has a rotational period of 6.4 days though.
No. A year on Earth is 365 1/4 days, while on Mars a year is 687 Earth days.