"bob haller" wrote in message
...


if one of those loose planets ever visited our solar system it could
cause a disaster, such a large body could alter the earths orbit

Not too likely, unless it came into close proximity of the Earth. Such a
planet would enter at superorbital speed, pass perihelion, and then fly
off into space, never to return.

Theres a asteroid following earth, a visiting large planet could and
probably will change the planetary alinement



What does planetary ALIGNMENT have to do with an asteroid "following earth"
whatever that means. (I'm guessing you might Cruithne?)

And that's only if it comes close enough. That said Jupiter already
perturbs things enough that I'm not worried about some random planet.

--
Greg D. Moore http://greenmountainsoftware.wordpress.com/
CEO QuiCR: Quick, Crowdsourced Responses. http://www.quicr.net