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The theory for our solar system is that the solar wind blew the lighter elements out beyond 3 astronomical units. The inner planets coalesced out of the heavier elements that remained.
Most of the solar systems we have found so far consist of large gas giants orbiting close to their primary star, so this theory does not account for that.
When you look at the rocks in a creek, you notice that some are smaller and some are larger. Lots of them are very small, and a few tend to be very large. There is no reason they should all be the same size.
Wiki User
∙ 11y ago
Wiki User
∙ 9y agoBecause there's nothing that makes them have the same size.
But there are physical mechanisms that determine the approximate sizes. For example a large planet would not be likely to form near the Sun because tidal forces would tend to break it apart and in any case the orbital speeds of elementary fragments is higher near the Sun. On the other hand at large distances the elementary fragments would be so widely spread out that they are less likely to coalesce into one or more planets.
These factors will give small planets close in and far out from the Sun, with larger planets in the intermediate zone.
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Why planets orbit the sun in different speeds?
it is different because the size.
Why does each planet have different facts?
planets have diffrent facts of other planets because of there size and distance from sun
Why do forces change on different planets and moons?
Because the mass of the planet - its weight and size - create different degrees of gravity.
How big do planets have to be to be in the solar system?
Well there's no size, how big must be because planets in solar system are different sizes and size is not important. Don't ask questions like this if you don't know what the solar system is!
How can you classify the size of the planets in the solar system?
The planets are normally classified in size by their equatorial diameter.
How is the size of the outer planets different from the size of the inner planets?
They are all bigger
Why planets orbit the sun in different speeds?
it is different because the size.
Are the planets different sizes and shapes?
No, they are the size of uranus ;)
Why does each planet have different facts?
planets have diffrent facts of other planets because of there size and distance from sun
How are other planets different?
The other planets are different from the earth in various ways. This includes distances from the sun, size, rotational speed, element composition and so much more.
Why do forces change on different planets and moons?
Because the mass of the planet - its weight and size - create different degrees of gravity.
How are the planets Pluto and Saturn different?
The size. Sturn is Much bigger. Saturn is not solid, Pluto is.
What two planets are most different in size?
Jupiter and Neptune, (if you're not counting Pluto as a planet!).
Why do each of your planets in the solar system look alike?
They don't because their different in size, shape, and color
Which planets have similar diameter?
The Earth and Venus are pretty close to being the same size (about 5% difference), and Uranus and Neptune are also pretty close to the same size (about 4% difference). All of the other planets are different.
How big do planets have to be to be in the solar system?
Well there's no size, how big must be because planets in solar system are different sizes and size is not important. Don't ask questions like this if you don't know what the solar system is!
What does planets mean in science?
Planets is the natural satellite of some accountable size orbiting the star.
