Solar system attacked by Centaurs every 200 to 300 years? Library of Ancient Astronauts agrees.

You may have a good reason to be concerned about all the space junk orbiting our planet, but even without our help this  solar system is not a very tidy place.

Just as the threat exists (statistically 1 in 5 billion, but exists nonetheless), that a piece of falling space junk will smash into your house or car and kill you,  there is always the small chance that a comet will end life on earth.

The area around the orbit of Neptune is littered with "the Trojan asteroids"  some of which may swing into the inner solar system becoming comets we can witness every 200 to 300 years.

According to Phenominica:

The origin of ... "short-period comets" is unknown but the immediate source is thought to be the Centaurs—these are a collection of an estimated million icy objects more than 1 kilometre across on elliptical orbits that come closest to the sun between the orbits of Jupiter and Neptune.

Only about 250 of these Centaurs have been imaged by telescopes. All are on unstable orbits, and have a big chance of receiving a gravitational boost when their orbit brings them near Jupiter or one of the other giant planets. Such perturbation could redirect them into the inner solar system - and possibly towards Earth.

As a wayward Centaur approaches the sun, its heat begins to evaporate the icy contents, resulting in a cometary tail.

Previous simulations of the Centaurs suggest something must be feeding them with extra material - each object will orbit for about 3 million years before it hits a planet, falls into the sun, is ejected from the solar system or simply disintegrates.

via Trojan asteroids around Neptune could hit Earth.

There is a theory that the Ica Stones of Peru are a library from an ancient advanced civilization that once visited our planet. According to the late Dr Javier Cabrera Darquea who owned the collection, the visitors left due to the threat of comets. Of course, skeptics claim that either the images below are not telescopes or the thousands of ica stone carvings were faked by one local man to sell to tourists.

The farmer who gave Cabrera his first stone was subsequently arrested for selling the stones to tourists.  In his defence, he said that he had not in fact found them in a cave, as he had told Dr Cabrera, but made them himself. Other local people continue to make these engraved stones. They are selling forged hoaxes – a Bad Archaeology double whammy! However, Cabrera countered this claim with the sheer numbers of stones. As well as the 20,000 or so in his collection and those sold to tourists, he said that locals have found about 50,000, while the cave contains another 100,000. This is too great a number to be the effort of a single poor farmer with little spare time to create so many hoaxes. Nevertheless, he maintained that he carved at least some of them. Neither he nor Dr Cabrera revealed the location of the cave that is supposed to contain the huge cache of stones.

For more about the stones, see my post, Did humans and dinosaurs co-exist?