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Because Earth is not the only planet in the solar system. The gravity of the others would gradually affect such a planet, bringing it into view in no more than about 30 years. Also, it would have gravity of its own, and would have been discovered by the pull it exerted on the rest of the solar system, including Earth!

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Q: How do we know there is not another planet in Earth's orbit on the opposite side of the Sun?
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Related questions

The planet with the orbit closest to Earths orbit is?

Venus


What planets orbit is farthest from earths?

Neptune is the outermost planet, and is farthest from Earth's orbit.


Is it possible that another planet we haven't found is following earths orbit?

Not a planet of any significant size, which would be easy to see, but it is possible that some pieces of rock are in a similar orbit to the Earth at the five Lagrangian Points of the Earth's orbit.


What planet is considered Earth's sister planet and why?

Venus is closest to the Earths size and mass - often referred to as Earths sister or twin planet. Its also the planet that gets closest to Earth, the next one orbiting inside earths orbit.


Which planet in the solar system has an orbit so eccentric that it crosses the orbit of another planet?

pluto


Orbit so eccentric that it crosses the orbit of another planet?

Pluto


What is the furthest planet from Jupiter?

Neptune, when Neptune is on the opposite side of its orbit from Jupiter.


Does earths mass determine its location in the solar system?

No. A planet's mass does not determine the position of its orbit.


What different about Pluto's orbit that the orbit in our other planet's solar system?

its orbit crosses with another plant


What is the path a planet takes to orbit another planet called?

We call that path the "orbit" of the orbiting body. Note: You would not ever see a planet orbiting another planet. At least, if you did, you would not call them both planets.


Which is larger the earth or the earths orbit?

the earths orbit because the earths orbit is the size of earth + the size of the moon


Why are Saturn's moons not planets?

A moon is an object that orbits a planet. A planet cannot orbit another planet.