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Copyright: AURA [ http://www.aura-astronomy.org/ ] Explanation: This galaxy is having a bad millennium. In fact, the past 100 million years haven't been so good, and probably the next billion or so should be quite tumultuous. NGC 4039 [ http://adsbit.harvard.edu/cgi-bin/nph-article_query?bibcode=1995AJ%2E%2E%2E%2E109%2E%2E960W&page=1&plate_select=NO&type=GIF&nosetcookie=1 ] was a normal spiral galaxy [ http://antwrp.gsfc.nasa.gov/apod/ap970419.html ], minding its own business, when NGC 4038 [ http://antwrp.gsfc.nasa.gov/apod/ap970506.html ] crashed into it. The evolving wreckage, known as the "Antennae [ http://galileo.ifa.hawaii.edu/~hibbard/n4038/n4038.html ]", is pictured above. As gravity [ http://loner.ccsr.uiuc.edu/cyberprof/physics/101/Lecture/L13P3.html ] pulls each galaxy apart, clouds of gas slam into each other and bright blue knots are formed. These knots are large clusters of stars imbedded in vast regions of ionized hydrogen gas [ http://www.phys.unm.edu/~duric/l2h/l6/node1.html ]. The high abundance of relatively dim star clusters is quite unlike our Milky Way's globular cluster system [ http://www.limber.org/globs.html ], though. Perhaps some of these young star cluster [ http://antwrp.gsfc.nasa.gov/apod/ap970214.html ]s will go on to form globular clusters [ http://antwrp.gsfc.nasa.gov/apod/ap961004.html ], while others will disperse through close gravitational encounters. The above picture [ http://archive.stsci.edu/cgi-bin/hst_proposal_search?proposal_id=304&action=search&show=data+abs ] is centered around the larger of the two interacting galaxies: NGC 4038. The diagonal streak across the upper left is unrelated to the colliding galaxies. The color contrast [ http://oposite.stsci.edu/pubinfo/LookLike/ ] in the above three-color mosaic was chosen to highlight extended features.
Copyright: AURA [ <a target="_blank" href="http://www.aura-astronomy.org/">http:...</a><a target="_blank" href="http://adsbit.harvard.edu/cgi-bin/nph-article_query?bibcode=1995AJ%2E%2E%2E%2E109%2E%2E960W&page=1&plate_select=NO&type=GIF&nosetcookie=1"></a><a target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap970419.html"></a><a target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap970506.html"></a><a target="_blank" href="http://galileo.ifa.hawaii.edu/~hibbard/n4038/n4038.html"></a><a target="_blank" href="http://loner.ccsr.uiuc.edu/cyberprof/physics/101/Lecture/L13P3.html"></a><a target="_blank" href="http://www.phys.unm.edu/~duric/l2h/l6/node1.html"></a><a target="_blank" href="http://www.limber.org/globs.html"></a><a target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap970214.html"></a><a target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap961004.html"></a><a target="_blank" href="http://archive.stsci.edu/cgi-bin/hst_proposal_search?proposal_id=304&action=search&show=data+abs"></a><a target="_blank" href="http://oposite.stsci.edu/pubinfo/LookLike/"></a>
AURA
 
Copyright: AURA [ http://www.aura-astronomy.org/ ] Explanation: Do star clusters form when galaxies collide? Quite possibly, according to Hubble Space Telescope [ http://antwrp.gsfc.nasa.gov/apod/ap970306.html ] observations of the "Antennae [ http://wwwatnf.atnf.csiro.au/people/bkoribal/antennae.html ]", two galaxies thought to be in the early stages of a collision. As NGC 4038 and NGC 4039 [ http://crux.astr.ua.edu/gifimages/ngc4038.html ] slowly merge, the combined gravity of each pulls the other apart, huge gas clouds collide, and new bright stars and dark dust [ http://antwrp.gsfc.nasa.gov/apod/ap961119.html ] are dispersed. Many blue knots of stars appear to be newly formed globular clusters [ http://antwrp.gsfc.nasa.gov/apod/ap970214.html ]. Red star knots [ http://isowww.estec.esa.nl/activities/info/iso_pr96/ngc4038.html ] are particularly interesting, as they might be globular clusters [ http://www.limber.org/globs.html ] that have not yet expelled early dust from their system. The above picture [ http://archive.stsci.edu/cgi-bin/hst_proposal_search?proposal_id=304&action=search&show=data+abs ] is centered around the smaller of the two interacting galaxies: NGC 4039. The color contrast [ http://oposite.stsci.edu/pubinfo/LookLike/ ] in the above three-color mosaic was chosen to highlight extended features.
Copyright: AURA [ <a target="_blank" href="http://www.aura-astronomy.org/">http:...</a><a target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap970306.html"></a><a target="_blank" href="http://wwwatnf.atnf.csiro.au/people/bkoribal/antennae.html"></a><a target="_blank" href="http://crux.astr.ua.edu/gifimages/ngc4038.html"></a><a target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap961119.html"></a><a target="_blank" href="http://antwrp.gsfc.nasa.gov/apod/ap970214.html"></a><a target="_blank" href="http://isowww.estec.esa.nl/activities/info/iso_pr96/ngc4038.html"></a><a target="_blank" href="http://www.limber.org/globs.html"></a><a target="_blank" href="http://archive.stsci.edu/cgi-bin/hst_proposal_search?proposal_id=304&action=search&show=data+abs"></a><a target="_blank" href="http://oposite.stsci.edu/pubinfo/LookLike/"></a>
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