I haven’t started coding yet, what is a in the Kepler forumla? It isn’t explained anywhere,

" Map the Debris

According to Kepler’s Third Law, the orbital period TT of two point masses orbiting each other in a circular or elliptic orbit is:

T=2πa3μ−−−√T=2πa3μ

- a is the orbit’s semi-major axis"

Am I supposed to know how to find “the orbit’s semi-major axis” by default? 'Cause I have no idea what the orbit’s semi-major axis is. Am I missing something?

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**Challenge:** Map the Debris

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