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VERY LARGE TELESCOPE



THE  WORLD'S   LARGEST   Telescope   system  ,  the  very  large   telescope  (VLT),  is  located  at  Cerro   Paranal in  the  Atacama  desert ,Chile.It  is    used  to  study   visible  light   and  to  collect  and  analyses  the    infrared   heat   energy   and  ultraviolet   radiation.During  a  one  hour  exposure ,  each  telescope  can   photograph ,  objects  that  are  four  billion    times  fainter  than  can  be  seen   with   the  naked   eye.  The   VLT  consist    of  four  telescope    units,  each  with  a  mirror  of   8.2  m(27 ft) in  diameter . These  units   can   be  used    individually   or  in  parallel,together   they    stimulate   one  large  telescope    with  a  mirror  of  16  m (52ft) in  diameter.Working  in  parallel  ,  a  process    known  as    interferometry,the  VLT   allows  celestial    objects    to  be   seen    in  much  finer   detail    than  with  the   Hubble  space  telescope .
On  23  May ,1998,one  of  the   telescope    units  took  its first   photograph   of  a  celestial   object ,  an   event  that   astronomers  call  ".  first  light ".The   VLT  will    be  used   principally   to  search  for  small , Earth  like  planets  around  other   stars.
TELESCOPE  SITE.
THE  VLT  IS LOCATED  AT THE  Summit  of  the  Cero  Paranal , a  mountain  in  the  Atacama  desert   Chile    at   2,632 m(8,655ft) above  sea level.The  site  is one  of the driest   place  on  Earth,despite being situated   only  12   km (7.5  mile)from  the  pacific  coast.The  mountain  top   site  provide   remarkable  conditions    for   observation  and  photography.There  are  up  to  350   cloud-free  nights  per  year ,  and images  are  stable  owing  to  the  lack  of   water  vapor  in  the  atmosphere.
VERY LARGE TELESCOPE






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