Collegeboard REAL CR Q's

mtgmackid
Fri, 30 Sep 2011 20:30:49 +0000

Seems to me like that they are using the word “indirectly” to show that extrapolation is used.

Basically, that text block is extrapolating the main idea (that these “alien planets” exist) from a “similar situation” (gravity affects the stars around them, similar to our solar system). The similarity is reflected in the prior sentence “Similarly, our solar system, once considered unique,
now stands as merely the first known example of a
45 planetary system in our galaxy,”

Hope that helps a little!