SAT Question aa7ae735: Words In Context answer and explanation

English - Words In Context - Meaning Of Word In Literary Prose
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The following text is adapted from Mohsin Hamid’s 2017 novel Exit West. Saeed lives with his mother and father. On cloudless nights after a daytime rain, Saeed’s father would sometimes bring out the telescope, and the family would sip green tea on their balcony, enjoying a breeze, and take turns to look up at objects whose light, often, had been emitted before any of these three viewers had been born—light from other centuries, only now reaching Earth. ©2017 by Mohsin Hamid
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Difficulty:Easy
As used in the text, what does the word “reaching” most nearly mean?