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Pastimes : NNBM - SI Branch -- Ignore unavailable to you. Want to Upgrade?

To: thames_sider who wrote (25756)	4/23/2003 5:37:53 PM
From: lurqer	Read Replies (1) \| Respond to of 104188

OK, a dino-era one would have vanished As my better half would quickly inform you, my mindset is more than a little odd. In Astronomy you get used to toying with different time scales - everything from the brief flicker of an electron in mid-transition to the age of the universe. So I always thought of the end of the Cretaceous as merely being a "recent" extinction, preceded by many earlier ones (Triassic, etc). I can see by your post that you don't realize how chaotic our Milky Way galaxy is. The solar system is in orbit about the Galactic center (period about 225 Million years hypertextbook.com ). Stars form from clouds of interstellar gas, and some will retain the motion of that maternal cloud. Such stars are said to be members of a cluster – that travels around the Galaxy as a group. Such stars are a small minority. Most are like our Sun , a single star, or are members of a multiple star system, like our neighbor Alpha Centauri (a triple). Such systems (single or multiple) travel around the Galaxy on their own unique orbit with a constantly changing set of neighbors. Any neutron star or black hole resulting from a supernova explosion in the Triassic would definitely fit into the category of “long gone.” Sorry if I ramble on. Ole prof, you know. lurqer