Question

which star is the biggest star ever?​

Answer 1

The largest star that we know of is called VY Canis Majoris 
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Answer 2

${ \tt{\underline{\green{ \underline{ \purple{ UY \: Scuti \: \: biggest \: star \: around \: 1700}}}}}} \\ { \tt{\underline{\green{ \underline{ \purple{ times \: larger \: than \: the \: sun. \: and \: The }}}}}} \\ { \tt{\underline{\green{ \underline{ \purple{ largest \: known \: \: star \: \: is \: called \: \: the }}}}}} \\ { \tt{\underline{\green{ \underline{ \purple{ Pistol \: Star. \:It \: is \: believed \: to \: \: be \: }}}}}} \\ { \tt{\underline{\green{ \underline{ \purple{100 \: times \: as \: massive \: as \: our \: Sun .}}}}}}$