The   Sun   is   our   star.      Here’s   a   nice   introduction   from   Dr.   Plait.       It’s   a   rather   typical   star ,   actually.     When   compared   to   the   Earth ,   we   see   that   a   star   is   an   entirely   different   type   of   object   from   a   planet.      It   is a   huge   sphere   of   hydrogen   and   helium   gas   almost   one   and   one   half   million   km   in   diameter.   It   is   a   fairly typical   star,   about   average   in   all   respects.   Its   spectral   type   is   G2V;   that   puts   it   right   in   the   middle   of   the   H-R   diagram.      The visible   surface   of   the   Sun   shows   indications   of   massive   storms    which   release   energy   into   space   and   toward   the   Earth.   We   have a   spacecraft   called   SOHO    that   regularly   monitors   the   Sun's   weather .      With   a   properly   filtered   telescope ,   we   can   see   a   variety   of features  on its surface.  This NASA video  shows the Sun in an entirely different light, quite literally. Since   we   believe   the   Sun   to   be   a   rather   typical   star,   we   can   make   some   assumptions   of   the   physical   details   of   most   other stars.      For   instance,   we   are   certain   that   other   stars   have   starspots ’.   We   see   other   features    on   the   surface   of   our   star   which must be similar to those seen on other stars. Here is an excellent documentary on the Sun  from the Discovery Channel.
Looking for a particular star?  Find it here!
Carpe Caelum
Carpe Caelum Stellar Astronomy