Step-by-step explanation:
The central idea of Suni Williams' life as presented in the text is becoming an astronaut and reaching her highest dreams through hard work.
We can see that mostly from these details provided in the text:
When Suni was young, she watched Neil Armstong's moon landing and was fascinated by it, dreaming of becoming like him one day
After finishing Naval Academy, Suni realized she can actually reach her dreams and that she is the only one stopping herself from doing so.
She trained hard at the International Space Station, even though her path through life didn't seem to lead her there and there were no early predictions of her historical success.
--------------------------------------------------------------------------------------------------------------- Hope it help!