I can compute that directly. Direct answer

• 40 light-years is about 2.35 × 10^14 miles.

Explanation

• A light-year is the distance light travels in one year, exactly defined as 9.4607304725808 × 10^12 kilometers or 5.878625373183e12 miles. Multiplying by 40 gives:
  • 40 × 5.878625373183e12 miles ≈ 2.3514501492732 × 10^14 miles.

If you’d like, I can show the conversion steps with your preferred rounding.