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Here is a list of all major planets and their diameters. Pluto no longer meets the criteria to be considered a major planet. Mercury 4,880 km

Venus 12,104 km

Earth 12,756 km

Mars 6,794 km

Jupiter 142,984 km

Saturn 120,536 km

Uranus 51,118 km

Neptune 49,532 km

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2006 a planet was demoted and taken off the planet list What was n its name?

In 2006 Pluto was redefined as a "Dwarf planet"; and not a true planet.


Has Pluto been taken of the list of planets because it is to small?

Pluto was demoted to "dwarf planet" status specifically because it isn't massive enough to have "cleared its orbit" of other objects. http://en.wikipedia.org/wiki/2006_definition_of_planet


What is the time taken for planets to orbit around the sun?

That is a "year" for that planet.


What are the three forms of planets like the Gas Giants?

There are three forms of planets within our own solar system. There are the 'rocky' planets, such as Mercury, Venus, Earth, and Mars, the 'gas' planets such as Jupiter and Saturn (freely interchangeable with 'Gas Giants') and the 'ice' planets that are Uranus and Neptune. Pluto, as you likely know, is no longer considered a planet but is now rather categorized as a 'dwarf' planet, of which there are now 40 known (and still growing) such objects that orbit our sun in the Kuiper belt. Bonus: initially billed as our '10th' planet when it was discovered in January 5, 2005 from images that were taken on October 21, 2003 (and actually found to be larger than Pluto) 'Eris' was also 'demoted' to being just a 'dwarf' planet. Both Pluto and Eris, had they retained their planetary status, would both be considered 'Icy' planets.


How come there is all this trouble over Pluto being a planet or dwarf planet when they are all just planets any way?

Because for years it was thought that there were 9 planets, which included Pluto. But, in recent years it has been discovered that there are other, smaller, dwalf or minor planets which lay beyond the orbit of Pluto. Some of these dwalf planets are as big or even possibly bigger than Pluto. So, a decision had to be reached to either downgrade Pluto to the status of a dwalf or minor planet or include all of these other objects (and nobody knows precisely how many there are) into the main system of planets. If they were all included allthe minor planets into the major system of planets they would all need to be named, so the decision was taken to downgrade Pluto to simplify matters. So now there are only 8 major planets and many more, mostly un-named and undiscovered minor or dwalf planets.


What planet was taken away from the solar system?

Pluto is the only one that has been taken away from the solar system for now but more planets are beginning to be argued over. Pluto was taken out because it was a moon.


The planet with the largest orbit?

Neptune is the planet that takes the longest time to orbit our sun, in terms of time taken and distance. Pluto and some other dwarf planets take longer, but these are not considered to be one of the eight major planets in our solar system.


What planets are in our solar system?

There are eight planets in our solar system. They are Mars, Mercury, Venus, Earth, Saturn, Neptune, Jupiter and Uranus. Pluto used to be considered a planet as well but has since been taken off the list of planets.


What do the length of the planets year and its distance from the sun have in common?

There is a relationship between the planets distance from the sun and the time taken for one orbit (planets year), described in Keplers third law. The square root of the time taken to orbit the sun is proportional to the cube of the average distance between the sun.


How long is a day and a year on the planet?

A planets day (solar day) is the time it takes to rotate once on its axis relative to the sun, the synodic period. A year on a planet is the time taken for the planet travel once around the sun.


How many planets in the solar system today?

8. That's excluding Pluto which had it's planet status taken away from it a few years ago because it was considered too small to class as a planet.


What is the relationship between the size of an orbit and the time taken by the planet to orbit the sun?

The relationship between the size of an orbit and the time taken by a planet to orbit the sun is described by Kepler's Third Law of Planetary Motion. This law states that the square of the orbital period (the time taken to complete one orbit) of a planet is directly proportional to the cube of the semi-major axis of its orbit (the average distance from the sun). In simpler terms, the larger the orbit, the longer it takes for the planet to complete its revolution around the sun. Thus, planets farther from the sun take significantly longer to orbit compared to those closer in.