posted on Jul, 23 2012 @ 11:44 PM
reply to post by n120by60w
The problem with spectrography in regard to comets and NEOs is that they are not emitting light of their own (additive spectrography) and we very
rarely get a bright enough light source shining through them (subtractive spectrography).
None the less, your idea of a cataclysm ejecting material into space, which could form comets, is possible, but only just.
A pole shift or loss of the magnetosphere while being disastrous to us, would not be sufficient to eject enough liquid into space to create a comet.
Similarly, a large volcanic eruption would probably not do so either.
We do know of chunks of Martian rock that have been blasted off Mars by impacts from space and those chunks have later fallen down on the Earth,
allowing us to examine them. In this way, perhaps a significant enough impact could carry enough ejecta into space to form a small comet.
One aspect of any such impact created comet would be that it's escape from the Earth's gravity would be such that it would assume an orbit relatively
close to the Earth. In most comets we see a different orbit indicating that the comet most likely originates somewhere on the far outer edges of the
Solar System and is falling inwards towards the Sun.
Most comets have a long period of orbit, indicating the vast distances that have been travelled.
edit on 23/7/2012 by chr0naut because: (no reason given)