Explanation for Question 45 From the Reading Section on the 2021 March Sat
All right. Question number 45, according to passage two, 2 they analyze microlensing events to what? 3 So we are looking for the purpose of the microlensing events and why they 4 are taking place. So in passage two, 5 it says they using this technique called microlensing estimated 6 the number of large rogue planets in our galaxy. 7 So that's really the purpose of using that technique. 8 Estimating the number of large rogue planets answer twice a day says 9 confirm the results of the earlier survey. 10 It's not the case that they end up confirming their results. 11 So, and there's no real evidence that they actually were even aware of that 12 survey or those results. When they set out to actually assess this, 13 I is eliminated because as discovered the minimum required mass for a planet to 14 be detected, um, while that's definitely a relevant issue or a question to what 15 we're looking at here, that's not why they were actually using these events. 16 It's not referenced in that paragraph C compare the relative sizes of main sequence 17 stars. Um, there's nothing really about Maine's, 18 uh, main sequence stars and their relative sizes, 19 um, as compared to free-floating planets. 20 So we can eliminate seeds. They're looking for a quantity here, 21 not a size measurement. So answer choice D is a much better fit. 22 Determine how many big free-floating planets exist. 23 This idea of how many is kind of in line with what they said 24 in the passage about counting. We're looking for a numerical quantity and Mount a 25 number of how many there are rather than any type of measurement about them. 26 So D is the best answer.