I don’t think your question can be answered in miles. The southern star Fomalhaut is 25 light years away. The star itself is surrounded by a disk of debris that measures 21.5 billion miles.
There are 5.88 x 10^12 miles in a light year, so Fomalhaut, being 25 light years away, is 25 x (5.88 x 10^12), or 1.47 x 10^14 miles.
147,000,000,000,000 (one hundred forty-seven trillion) miles away.
Fomalhaut is a star, not a planet. Fomalhaut b is a planet in orbit around that star.
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