Although all planets have elliptical orbits, Venus has the least eccentric orbit (eccentricity of 0.00677323, where 0 would be circular)
Its Venus because the eccentricity of venus is close to zero and the more close the eccentricity is to 0 the more perfect circle it is.
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venus
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Mercury
As an elliptical orbit is any orbit that isn't perfectly circular, everything has an elliptical orbit. The planets Mercury and Pluto have the most elliptical orbits of the planets, and are easily seen to be oval shaped. Comets also have highly elliptical orbits.
Probably Venus, who's orbit varies only imperceptibly from a perfect circle. Venus's orbit is elliptical, but not so the average layman would notice (to astronomers, of course, it is quite different).
The earth's orbit is almost a circle, but not quite. It is elliptical, but the difference between the closest and farthest points is less than 4%. This is such a small difference that it would look like a circle to most people. Astronomy books often show misleadingly exagerated elliptical orbits.
Pluto has the most oblique orbit. All the planets have elliptical orbits, however Mercury has the most elliptical orbit since Pluto is now considered a dwarf planet. This information is provided by the Royal Astronomical Society of Canada and available online [see related links].
Venus has the least eccentric (most nearly circular) orbit of the eight in our solar system.
Mercury
No, it is a normal orbit with an average radius of 30.06 astronomical units. Apart from Venus Neptune has the most nearly circular orbit, and those two planets are the only ones with an eccentricity factor less than 0.01.
As an elliptical orbit is any orbit that isn't perfectly circular, everything has an elliptical orbit. The planets Mercury and Pluto have the most elliptical orbits of the planets, and are easily seen to be oval shaped. Comets also have highly elliptical orbits.
Venus' orbital path is the most circular of all the planets. The eccentricity of the orbit of Venus is less than 0.01.
Most but not all larger MOONS (bodies that orbit planets, moons, or asteroids) accreted in the same way that PLANETS did, assuming a variable density and a nearly spherical shape. Very large moons such as Titan have many of the characteristics of planets: vulcanism, atmospheres, and weather. Generally speaking, moons orbit planets in the same way that planets orbit stars.
The orbits of the planets, including Mars, are eliptical, not circular. Keplers observed positions did not fit a circular orbit. The differences led him to discover that the orbits were not circular, but eliptical.
Probably Venus, who's orbit varies only imperceptibly from a perfect circle. Venus's orbit is elliptical, but not so the average layman would notice (to astronomers, of course, it is quite different).
A planet has a circular orbit, with the exception of pluto. A comet has a large but eliptical orbit. An asteroid has no orbit unless it becomes a moon. A meteor has no orbit. It usually flies in a straight line either burning up in the atmosphere or impacting on a planets surface. So, A comet.
Most people don't think this but planets are actually held in orbit by gravity. With out gravity the planets will fall down.
No, they don't. But most of our planets that orbit the sun do.
no, many planets have an orbit that is more of an oval shape. Few planets actually revolve around the sun, such as the moon, which actually revolves around the Earth, because earth has the closest amount of high atmospheric pressure. Also the sun is not the center of the universe. It is probably a humongous black hole about 28,000 lightyears away. So, Schmidt, You are not the center of the universe. (c)