The ISS (International Space Station) orbits Earth about once every?

A. 60 minutes at an altitude of about 400 km
B. 60 minutes at an altitude of about 500 km
C. 90 minutes at an altitude of about 400 kmCorrect Answer
D. 90 minutes at an altitude of about 500 km
Correct Option: C. 90 minutes at an altitude of about 400 km

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