Question

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name the largest star of Galaxy . nd name second largest star too .

Answer 1

The largest star in the Galaxy is
Vy Canis Majoris
The second largest star in the Galaxy is
Cephei

Answer 2

There are six stars known to be larger than VY Canis Majoris (which has a radius of 1,420 ± 120 R [math]_{☉}[/math]). They are:

•KY Cygni — 1,420 R[math]_{☉}[/math] (but could be up to 2,850 R[math]_{☉}[/math])
•V354 Cephei — 1,520 R[math]_{☉}[/math]
Westerlund 1-26 — 1,530–1,580 R
[math]_{☉}[/math] (but could be up to 2,544 R
[math]_{☉}[/math])
•RW Cephei — 1,535 R[math]_{☉}[/math]
•WOH G64 — 1,540 R[math]_{☉}[/math] (but could be up to 1,730 R[math]_{☉}[/math])
•UY Scuti — 1,708 ± 192 R[math]_{☉}[/math]


UY Scuti has officially been named the largest
known star in the galaxy, surpassing previous record holders such as Betelgeuse, VY Canis Majoris, and NML Cygni.

UY Scuti has the largest overall size of any star currently known, with a radius of 1,708 ± 192 R☉

So, second largest is WOH G64.