vacabulary 9 Stars

Star  a large , hot ball of gases , wich is held together by gravity and gives  off its own light .

Parallax   the apparent shift in a object location when viwed from two positions .

Light year  the distance that light travel in one year .

Constellation  a number of stars that appears to from a patern . 

Magnitude  the brighness of a star .

Nebula  cloud of gas and dust in the space .

Supernova  star that explodes .

Black hole an object whose gravity is so strong that light can´t  escape it .