Back to Home

General Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Misc. Topics | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Re: Directional Flow

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Paul Rest/">Paul Rest on January 2, 1999 00:23:37 UTC

I didn't see that photograph, but I can tell you a thing or two about spiral galaxies. There is no law in the universe that says sprial galaxies must spin a certain way, therefore they go any way they want, which is probably dependent on the way in which they form. However, I can see you are suffering under the common misconception about spiral galaxies that they act like whirlpools, they do not. All a spiral galaxy is is a disk a material, stars, gas, dust, whatever. The spiral shape comes from the fact that there are "density waves" traveling through the galaxy's disk spurring star formation. Since the stuff that is orbiting a galaxy's center near the center is traveling at the same speed as the stuff near the edge of the galaxy, it completes its orbit faster. The end result of of this is these "density waves" of star formation get stretched and pulled out into those beautiful spiral arms we see. Hope this helps.

-Paul

: In the latest pictures from HST of NGC 7742 it appears that this 'system' is spinning in a counter-clock wise direction. Is this most probably due to the position of NGC 7742 in relation to HST, or can it be attributed to gravitational pull? The same pull that makes water going down a drain flow counter-clock wise in the northern hemisphere and clock wise in the southern hemisphere. (Assuming that is what makes that occur on earth)

Follow Ups:

    Login to Post
    Additional Information
    Google
     
    Web www.astronomy.net
    DayNightLine
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2019 John Huggins All Rights Reserved
    Forum posts are Copyright their authors as specified in the heading above the post.
    "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
    are trademarks of John Huggins