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

the dwarf planet Pluto .... But really should be a planet :)

None of the eight planets has an orbit that crosses another. Dwarf planets (which include Pluto) and Dwarf Planet candidates do cross orbits of planets and each other when viewed from above. ...

All the planets in our solar system have elliptical orbits. The planet that has the most eccentric orbit is Mercury. The planet with the largest orbit is Neptune. ...

Mercury has an elliptical orbit, it is also one of the most eccentric orbits of our solar system. ...

Not as far as we know. There could be another planet with oxegen, but it must be is another solar system, or galaxy. ...

extrasolar planet orbits tend to be closer and more eccentric than in our Solar System ...

Mercury's orbit is moderately eccentric, at 0.2056, while Venus's orbit is the least eccentric of any planet in the solar system, at 0.0067. Mercury's inclination is at 7º, while Venus's is at 3.39º. ...

Within our Solar System, Pluto was until it was dubbed a dwarf planet. The current farthest planet is Neptune. Since Pluto has an orbit so eccentric that it is sometimes inside the orbit of Neptune, the identity of the "outermost planet" was previously time-dependent. ...

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, they are dwarf planets. Pluto is not a planet, it is a dwarf planet. The difference is that dwarf planets have an eccentric or elliptical orbit, and that they are small. the dwarf planets in our solar system are kuiper belt objects. ...

its orbit crosses with another plant

All the planets in the solar system have very low eccentric orbits.

Long period comets. Nothing else is NEARLY so eccentric.

Comets. Periodic comets have highly eccentric elliptical orbits, with eccentricities. ...

Makemake is a dwarf planet. It is the third largest known dwarf planet in the Solar System and one of the two largest Kuiper belt objects. Because of it's eccentric orbit, if it was a planet, it would be either 9, 10 or 11. See related link for a pictorial. ...

it has life hello it is our planet

Yes a Jovian type planet in another star system can have a moon as big as Mars. As of June 2014, it is unknown if one exists. ...

I REALLY hope the first answer was a joke. Earth is the only planet in our Solar System known to have life. Pluto was demoted to Dwarf Planet because of its irregular (eccentric or elliptical) orbit around the sun. Its small size was also a factor. ...

Jupiter has the shortest "day" of any planet in the solar system.

Neptune's place in orbit is relatively after Uranus's orbit. It being the eighth and final planet in our solar system (Pluto is not a planet), Neptune crosses with Pluto in the orbit making it the ninth planet until Pluto was kicked out. ...

concentrate in one planet and if you already master it move on to another planet ...

No; not that we are aware of, anyway...

There are lot's of planets out there, 7 in our solar system alone. :P

no one thinks that there is life on another planet, they are either too hot, too cold, or too far away ...

In 2006 Pluto was degraded to the status of dwarf planet (there is another dwarf planet, Eris, that is more massive than Pluto). ...