51. HR 5171A:

♤ It is the largest yellow star discovered till now.

♤ It is around 1300 times more than diameter of sun.

♤ Scientists have used a technique called interferometry that combinesthe light collected from multiple individual telescopes to discover the star.

♤ Yellow hypergiants are very rare and only about a dozen of such stars are known in our galaxy These stars are among the biggest and brightest known stars and are at an unstable stage of their lives and are changing rapidly. This instability allows them to expel material outwards by forming a large extended

atmosphere around themselves