For part (a), we have:
- Speed: $v = 1330 \,\text{km/s} = 1.33 \times 10^6 \,\text{m/s}$
- Radius: $r = 25 \,\text{light-days} = 25 \times 24 \times 3600 \times 3 \times 10^8 \,\text{m} = 6.48 \times 10^{15} \,\text{m}$
We can use the formula for the centripetal
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