Answer :
The revision that the writer should make to account for the audience’s expertise is deleting the parenthetical phrase “a theoretical sphere of icy debris at the outer edge of the solar system”.
What is a solar system?
Our solar system contains the sun, moon, asteroids, stars, and all the planets with in.
The solar system bound all the component within their place with a gravitational force.
As, in the statement, there is given that the audience is familiar with the concept of solar system.
So, they would know that comets are the icy debris on the outer edge of the solar system.
Hence, this sentence can be deleted.
Thus, the correct option is 5, deleting the parenthetical phrase “a theoretical sphere of icy debris at the outer edge of the solar system”.
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