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No but the sizes of OTHER planets and planetesimals can and do.

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0All planets have at least some elongation or orbital eccentricity and thus not a perfectly circular orbit. Since Pluto was demoted from true planet status, Mercury is now the planet with highest eccentricity (of about 0.21)

Mercury's orbit has the highest eccentricity of all the Solar System planets. It used to be Pluto, but Pluto is now a dwarf planet. Also if you were wondering Mars has the 2nd highest eccentricity.

No, all the planets have orbits that are technically ellipses with low eccentricity. Apart from Mercury all the other seven planets have orbits that are very nearly circular, but the Sun is offfset from the centre of the circle by a different amount for each planet depending on the eccentricity of the orbit.

Of the planets in our solar system, Venus has the smallest eccentricity.

the planet orbit called venus has an eccentricity of 0.007.

All the planets move with an elliptical orbit, but with a very low eccentricity.

What you are referring to is the eccentricity of the planet's orbit around the sun. Eccentricity of a circular orbit is 0.0, whereas the eccentricity of an extremely elongated orbit is 1.0. So the closer the eccentricity of a planet's orbit is to 1.0, the more elongated is its orbit around the sun. Many extra solar planets have high eccentricities in accordance with their parent stars. In our solar system Mercury ( .20563) and Pluto (.24880766) have the highest eccentric orbits.

None of the planets orbit the sun perfectly in a circle, there is a degree of deviation from this perfect circle called eccentricity. The higher the eccentricity (more more the eccentric the orbit is) the further away from this perfect circle the orbit is. The planet that deviates most from a perfect circle, having the highest eccentricity, is Neptune. Neptune also has the highest axial tilt, tilted over onto its side as it orbits the sun.

The Earths orbit is fairly un-eccentric when compared to the other planets, with only Neptune and Venus having more regular (less eccentric) orbits. The eccentricity of earths orbit is 0.0167, the closest to this is Neptune's, with a value of 0.00859

All planets orbit the Sun in an elliptical orbit. An elliptical orbit is defined as having an eccentricity of between 0 and 1. (0 is a circular orbit). Anything over 1 is defined as a hyperbolic orbit.Mercury has the highest eccentricity of .205630 whereas the Earth has a near circular orbit with an eccentricity of 0.0167.Triton, a moon of Neptune has lowest eccentricity with a value as close to 0 as can be measured.

Although all planets have elliptical orbits, Venus has the least eccentric orbit (eccentricity of 0.00677323, where 0 would be circular)

The eccentricity value measures how non-circular an orbit is. The planets in decreasing order of eccentricity with their approximate eccentricity values are: # Pluto: 0.25 # Mercury: 0.21 # Mars: 0.093 # Saturn: 0.056 # Jupiter: 0.048 # Uranus: 0.047 # Earth: 0.017 # Neptune: 0.0086 # Venus: 0.0068

Planets orbit stars, not other planets. A planet-like object that orbits a planet is a moon.

No planet has a perfectly circular orbit, though Venus has the least orbital eccentricity of any planet in our solar system.

Moons orbit planets. Planets (and dwarf planets) orbit stars.

I am not familiar with planets evolving around any singular planet. If you are referring to orbit, the planets orbit the sun, a star, not a planet, in our solar system. Some planets have moons in their orbit.

Mars has the most "elliptical" orbit. Its eccentricity is 0.2. Eris has an even larger eccentricity, 0.44, nearly double that of Pluto's 0.25.

Kepler's Laws: The orbit of a planet is an ellipse with the Sun at one of the two foci. A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time. The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.Eccentricity: the eccentricity of a planet's orbit is not an angle, it is a measure of how far each focus is from the centre of the ellipse. Most of the planets' orbits have low eccentricity so that the Sun's distance from the centre is the main effect of eccentricity.The Earth's orbit has an eccentricity of 1/60 so that the Sun is 149.6/60 million kilometres from the centre, approximately 2.5 million km. That means our distance from the Sun varies from 147.1 to 151.6 million km approximately.

Planets orbit the sun; moons orbit a planet.

The orbit of Mercury has the highest eccentricity of all the Solar System planets

Earth has an average eccentricity in its orbit of 0.0167. This compares with 0.0068 for Venus and 0.205 for Mercury, which are the minimum and maximum eccentricities in the eight planets. So, the Earth's orbit is not too far from circular. In order of increasing eccentricity, the list of planets is: Venus Neptune Earth Uranus Jupiter Saturn Mars Mercury.

Venus has an eccentricity of 0.00677323 Neptune has an eccentricity of 0.00858587 Triton, a moon of Neptune, orbit is as close to a perfect circle with an eccentricity of 0.000016 The Earth for comparison has an eccentricity of 0.01671022

Kepler discovered that the planets move in ellipses. The shape of an ellipse is described by the eccentricity. For low eccentricity such as the planets' orbits have, the orbit is very close to being a circle but the most significant difference is that the Sun is off-centre. After Newton's law of gravity was discovered, it was found that the Sun's gravity force would make a planet move in an elliptical orbit naturally. The force is stronger when the planet is closer to the Sun, making it move more quickly and sending it out to a more distant part of the orbit where the force is weaker and the speed is less. So the elliptical orbits have been explained and the planets' positions can be predicted accurately.

By definition planets orbit a star and satellites orbit a planet. Therefore there are no satellite planets.

When don't they? If a planet is in orbit around a star, it is in continual orbit. Orbital periods (the lengths of time it takes different planets to complete one orbit) are different from planet to planet, and are related to the distances between the planets and their stars.

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