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In this excerpt from the "Astronaut Requirements" article by NASA, the main purpose is to **inform**. Here's why:
1. The passage states, "Astronaut requirements have changed with NASA's goals and missions." This indicates that the text is aiming to provide information about how astronaut requirements have evolved over time in response to NASA's changing objectives.
2. The passage goes on to mention, "Today, to be considered for an astronaut position, applicants must meet the following qualifications." This further reinforces the idea that the primary purpose of the excerpt is to present specific qualifications required for aspiring astronauts, which falls under the category of informing the reader.
Therefore, the main purpose of this excerpt is to inform the reader about the qualifications needed to become an astronaut, rather than to entertain or persuade.
