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Obviously it's astronomically unlikely, but can another planet or celestial object exist in our solar system - on the opposite side of the sun, without us knowing it? Either
> mirroring Earth's orbit
Or
> slower/faster than Earth's orbit so it disappears and reappars, ie. last seen 1400s, will reappear in 2017
I don't know shit about astronomy and it's been bugging me
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it would be noticed through its gravitational influence
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>>8515374
>without us knowing it?
Nope, we would have been able to detect perturbations in the orbit of other planets/moon also I think the Lagrangian points would be different if there was another planet shadowing us.
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Short answer no. Longer answer it would not be possible for such a massive object to be 'hidden' as it would interact with other objects in the solar system due to its gravitational effect.
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In our same orbit? That's physically impossible buddy, the Earth and that other planet would have already collided millions of years ago.
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>>8515374
> can another planet or celestial object exist in our solar system - on the opposite side of the sun, without us knowing it?
Nope. An L3 orbit is unstable, an object near L3 would tend to get pulled way by Venus, and that point is one of the first places that were examined by the early space-observation satellites.
And something the size of a planet at L3 would have been noticed due to its effects upon the orbits of the other inner planets.
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