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Fraser
2005-Mar-29, 05:57 PM
SUMMARY: Galaxies are built up over time through a series of collisions with other galaxies. Each time this happens, clouds of gas and dust collapse and become regions of furious star formation. The European Space Agency's ISO infrared space telescope has shown the early stage of a collision between two galaxies (NGC 4038/4039) 60 million light-years away. The overlapping region between the galaxies is very rich in molecular hydrogen in an excited state. The shock waves are just starting to collapse the gas, and should lead to starbirth in the next few million years.

View full article (http://www.universetoday.com/am/publish/galaxy_collisions_lead_starbirth.html)

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lswinford
2005-Mar-29, 07:20 PM
I wonder how many binary systems are the collective captures of a galaxy merger. Then too, with stars passing stars, does their gravity (and perhaps a piece of magnetism) generate a comparative low-pressure zone where gasses boil off and into the interstellar medium or are there other mechanisms to feed the extra hydrogen for new star formations?

Greg
2005-Mar-30, 04:27 AM
This is a very nice article, and the conclusions make alot of sense. It is seemingly obvious that is would appear self-evident that shock waves may have this effect on hydrogen clouds. It also goes a long way towads explaining early galaxy evolution via the merger and accumulation method (leggo-set construction method of numerous protogalaxies.) So it looks lke the standard theory of galaxy evolution is far from dead and it is possible to correlate data from deep field studies of earlier than expected galaxy formation considering this finding.

Mr. Smartypants gamer guy
2005-Mar-30, 04:25 PM
hey if these stars are coming into action and stuff couldent that make the posiblity for "another earth" more likly? :unsure: :D B) :unsure:

lswinford
2005-Mar-30, 07:57 PM
"Another earth" or other such civilization, as commonly conceived is a bit of a numbers game. Given the vast number of stars, the share of those stars that are similar to our sun, the potential location for a planetary body orbiting at some appropriate and stable zone for life, as we know it, to develop, as we assume such, then the odds are supposedly good that several somewheres, locations not yet known, will have developed essentially as we have--other earths. Now that we add new stars into the mix, messing up old mechanics of the dance of stars about our galaxy, making new stars, presumably with new planets, then yes some of them might fall into development along favorable and familiar lines.

But what if some of this new interaction has destroyed some otherwise favorable locations? With the destructive/constructive solar development, which is more likely, good systems gone bust or potentially good systems born? I bet its a wash, but I won't bet much. :rolleyes: