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More interesting than asteroids is the rogue planet theory that every 3600 years or so a planet in a highly eccentric orbit passes near earth and causes serious damage.Enough damage that civilizations have been wiped out time and again and have left little evidence of their pre-existence. The pyramids and the Sphinx are the oldest structures to have survived these cataclysms.

The orbit of the rogue "captive" planet is in a plane @ 60 degrees beneath the eliptic and it orbits "up" through the solar system between jupiter and mars (the mars asteroid belt is part of the damage to other moons caused b y the giant (bigger than jupiter) rogue planet.

The only place to put telescopes to look for this planet is in South America or Australia and there ARE observatories searching at this point in time. This planet doesn't reflect light, it's pretty far out there and given we can't see asteroids till they're nearly on us...

More telescopes, both on earth and in orbit are needed to spot this thing. It's not due back here again for a thousand years of so.

Or how about the scenario where a different universe (using the "multiverse" cosmological
construct passes tooooo close to our "universe" causing dark matter to be
deflected right into this planet! AHHHHHH!!!! One of the problems with all of
these science fiction scenarios, is that since we really don't know everything and
what is going on yet...it is extremely difficult to predict what will happen.
As an example, in the description of "Accelerando" they are talking about
leaving their "bodies" behind to take a space vehicle to another part of
the galaxy. I would guess, we don't even know if those galaxies still exist.
The light from their destruction event may not show up here for thousands of years.
Also, the energy in the universe could be running out, then what? Try the next universe?
Then what?.....
Heavy, Dude.

More interesting than asteroids is the rogue planet theory that every 3600 years or so a planet in a highly eccentric orbit passes near earth and causes serious damage.Enough damage that civilizations have been wiped out time and again and have left little evidence of their pre-existence. The pyramids and the Sphinx are the oldest structures to have survived these cataclysms.

If the time placed is 3600 years that would mean that last happened around 1600 ~ 1700 B.C., about hte same time as the fall of the Minoan civilisation and the Harappan civilisation. however, there are ziggurats in Sumeria that are older than the pyramids and are still standing

"More interesting than asteroids is the rogue planet theory that every 3600 years
or so a planet in a highly eccentric orbit passes near earth and causes serious damage."

Utter nonsense. Enough.