1. The largest stars that we currently know of (such as UY Scuti, VY Canis Majoris, and KY Cygni) would reach past Jupiter, and possibly even make it to Saturn if you take the upper bounds of the size estimates. And as a reference, Jupiter is about 5 times farther and Saturn is about 10 times farther than the Earth is from the Sun.

  2. I know nothing about how big a star *could* be, but it seems that largest known star is [UY Scuti](https://en.wikipedia.org/wiki/List_of_largest_stars) with a radius of 1708 (give or take 192) solar radii, which is a radius of about 1,188,255,600km. That’s just shy of 8AU (7.94AU), which is 8 times the distance from the Sun to the Earth. So if UY Scuti were in the place of the Sun, its surface would extend well past the furthest point of Jupiter’s orbit (5.45AU), ending closer to the orbit of Saturn (9.02AU from the Sun at its closest)

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