Cactus Patch Observatory / 14" LX200
"The four points of the compass be logic, knowledge, wisdom, and the unknown. Some do bow in that final direction. Others advance upon it. To bow before the one is to lose sight of the three."
-------------- Celestron C8 on ASGT Celestron First Scope 114 Stellarvue 70ED Celestron Nexstar 60 Celestron accessory kit Celestron UHC 1.25 filter Celestron UV/IR cut off filter Celestron NexImage
"After the Laws of Physics, everything else is opinion" -Neil deGrasse Tyson
Elmira-Corning Astronomical Society
Chris Small telescopes, some medium size, a smattering of eyepieces and filters. The human brain-a 3 pound, 30 watt, self-programming supercomputer that can be mass produced by unskilled labor. Member IDA
A man is a small thing, and the night is very large and full of wonders.
HyperTuned CGEM and G11wG2 SV115T20, Meade SN-8, AT-66, and modified 20d. Nebulosity, SkyTools3, TSX, and Pixinsight.
"Scientists aren't perfect, just peer reviewed.""Eye of Sauron Observatory", featuring "Sauron's Other Eye", 16" dob, conical Royce mirror.
Quote:Science is a bazaar, not a cathedral
Quote:I don't know of any evidence that the original length of the Earth's year was any different than today's, but then, I wouldn't expect such evidence to be preserved after 3.9 billion years.
Quote:If Earth has migrated from a different orbit to its current distance from the Sun, then the Moon tagged along for the ride. One could approach the question from a standpoint of what one would expect to find at or near the lunar surface. For example, should older lunar impact craters exhibit certain characteristics if they were made by asteroids typically orbiting at different distances from the Sun?Another approach could be to compare a model of Earth's structure--especially the core--with models of the solar nebula and the distribution of heavy elements during the time of planetary formation. If Earth had formed elsewhere, should its iron core be smaller or larger? Differently composed?Finally, If the Earth were in a different orbit 1 to 2 billion years ago, shouldn't the geological record retain some evidence of climatic evolution tied to a move from the former to the current location? There are places on Earth where one can gain relatively easy access to rock layers that were formed 1 to 2 billion years ago. Let's have a look.As to the question of whether or not Earth migrated to its current orbit from another, I look at the two options--formed here and survived because it's a stable orbit versus formed in an unstable orbit and was lucky enough to move to a stable orbit--and I lean in favor of the former. In the absence of persuasive evidence to the contrary, it seems more likely that a planet will remain in the stable orbit in which it formed versus moving from an unstable to a stable location.Bill in Flag
Quote:We have a very dynamic history to deal with, and much of its effects are un-postdictable.