الزمن العميق

TODO machine-draft translation: English for review.

Earth has weathered about 4.5 billion years and roughly 20 trips around the center of the Milky Way, and it's still in one piece.

About 4.5 billion years rounds the U.S. Geological Survey age of 4.54 billion years. NASA Science gives about 230 million years for one trip around the Milky Way. An older NASA page gives 250 million years. Roughly 20 trips divides that age by a galactic year in that span. USGS: Age of the Earth · NASA Science: about 230 million years · NASA: 250 million years

العودة إلى الديناصورات · BorealopeltaNigersaurusTriceratopsStegosaurus