Final answer:
The details in paragraphs 7 and 8 of the speech emphasize the commitment and transparency of the nation's space program, indicating its endurance.
Step-by-step explanation:
The details in paragraphs 7 and 8 of the speech refine the central idea that the nation's space program will endure because they emphasize the commitment and transparency of the program. In paragraph 7, the speaker mentions that the space program is upfront and public, highlighting its openness. In paragraph 8, the speaker states that there will be more shuttle flights, crews, and volunteers, indicating the continuation of the program. These details reinforce the idea that the space program will persist and continue to make progress.