Interplanetary Iceberg

A chunk of ice from a comet hit Tugunska 1908.

On Dec 8, 4:25 pm, wrote:
A chunk of ice from a comet hit Tugunska 1908.

I believe our Selene/moon was once an interstellar iceberg.

Arctic ocean basin 12,500 ~ 12,900 BP

~ BG

There was a long discussion about this on one of the major popular
science magazines recently, given that it was the centenary of the
event.

The orbit has been worked out and has been found to be similar to that
of an asteroid rather than similar to that of a comet. But that
doesn't rule out short period comets. There has been a lot of
discussion about whether an asteroid could completely burn up in the
atmosphere and it seems that a common chondrite could.

The Tunguska object could have been a fragment of comet Encke, which
is in an asteroid-like orbit. A comet would leave fewer remains on the
ground than an asteroid.

On Dec 8, 10:07 pm, "
wrote:
There was a long discussion about this on one of the major popular
science magazines recently, given that it was the centenary of the
event.

The orbit has been worked out and has been found to be similar to that
of an asteroid rather than similar to that of a comet. But that
doesn't rule out short period comets. There has been a lot of
discussion about whether an asteroid could completely burn up in the
atmosphere and it seems that a common chondrite could.

The Tunguska object could have been a fragment of comet Encke, which
is in an asteroid-like orbit. A comet would leave fewer remains on the
ground than an asteroid.

An icy Selene of 7.4e22 kg is a sufficient asteroid for having created
our Arctic ocean basin.

~ BG

On 9 Dec, 00:25, wrote:
A chunk of ice from a comet hit Tugunska 1908.

There is an alternative explanation which I think people should be
made aware of. It was a methane explosion and not of extraterrestrial
origin at all. Masses of methane are embedded all over the Tundra.

http://paranormal.about.com/cs/earth...aa021604_2.htm

http://www.geocities.com/CapeCanaver...0/tunguska.htm

Gives some good references.


- Ian Parker

On Dec 9, 5:56 am, Ian Parker wrote:
On 9 Dec, 00:25, wrote:

A chunk of ice from a comet hit Tugunska 1908.

There is an alternative explanation which I think people should be
made aware of. It was a methane explosion and not of extraterrestrial
origin at all. Masses of methane are embedded all over the Tundra.

http://paranormal.about.com/cs/earth...aa021604_2.htm

http://www.geocities.com/CapeCanaver...0/tunguska.htm

Gives some good references.

- Ian Parker

It could have been a little bit of both, as ET ice impactor triggered
and local methane fueled.

~ BG

On Dec 8, 5:37 pm, BradGuth wrote:
On Dec 8, 4:25 pm, wrote:

A chunk of ice from a comet hit Tugunska 1908.

I believe our Selene/moon was once an interstellar iceberg.

Arctic ocean basin 12,500 ~ 12,900 BP

~ BG

btw, a thick layer of ice makes for terrific radiation shielding, as
well as provides a good thermal insulation barrier.

~ BG