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Re: The Return of The Thagomizer... :-)
Richard W. Travsky writes:
ARGH! Of course. It will continue to get brighter and brighter. The end
of life due to overheating is scheduled for one billion years in the
So, how much "dimmer" or "less bright" was the sun during the days of
What effect, if any would this have had on dinosaur evolution? Eyesight,
The sun is thought to be around 4.5 billion years old.
If it started out 70% as bright as it is now, that means it's increased in
initial brightness by a further 40% (ie. it's now 140% of the brightness it
began at). That's a 1% increase in initial brightness every 112.5 million
years on average (assuming a simple linear trend).
If my thumbnail calculations are correct, then the sun has only increased
(relative to it's initial brightness) by a further 0.58% since the end of
the Cretaceous. Dinosaurs probably lived through less than a 2% increase in
brightness due to increased solar output during their entire reign on earth.
Super-volcanic eruptions or major bolide impacts probably had a much greater
effect of apparent solar brightness (and in the opposite direction).
GIS / Archaeologist geo cities.com/dannsdinosaurs
Melbourne, Australia heretichides.soffiles.com