Meaning of than in the senctence

Question

Could anyone please tell me , what's the meaning of "than" in the following sentence?Computer science is no more about computers than astronomy is about telescopes.

Vorpar · Accepted Answer

http://www.merriam-webster.com/dictionary/than

Tinker Val · Answer

I think its performing as a comparison.
Some useful explanation i have found .

conjunction

(used, as after comparative adjectives and adverbs, to introduce the second member of an unequal comparison): She's taller than I am.
(used after some adverbs and adjectives expressing choice or diversity, such as other, otherwise, else, anywhere, or different, to introduce an alternative or denote a difference in kind, place, style, identity, etc.): I had no choice other than that. You won't find such freedom anywhere else than in this country.
(used to introduce the rejected choice in expressions of preference): I'd rather walk than drive there.
except; other than: We had no choice than to return home.
when: We had barely arrived than we had to leave again.

preposition

in relation to; by comparison with (usually fol. by a pronoun in the objective case): He is a person than whom I can imagine no one more courteous.

Meaning of than in the senctence

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