William Shatner talks new book 'Boldly Go,' death and Leonard Nimoy

The true final frontier for all  people—and William Shatner—is our unavoidable mortality.

The most well-known "Star Trek" captain, who at 91 became the oldest person to journey into  space with Blue Origin last year.

In his latest book of personal writings, "Boldly Go: Reflections on a Life of Awe and Wonder," he wonders if the Earth is passing  by his capsule window.

"I've reached the point where I'm noticing my breathing. I must  still be alive. States Shatner  to USA TODAY.

"I'm not completely unfamiliar  with the idea of dying. What am  I thinking about, and how am I handling that?"

In an interview with USA TODAY, Shatner discussed his rekindled friendship with the late Leonard Nimoy as well as his general message of hope.

By any means necessary, "I'm trying to convey how we're all together," he declares. "And how the cosmos is unified by that unification."

You learned that you were difficult for "Star Trek" cast members during and after the illustrious run of the TV programme from Nichelle Nichols, who passed  away in July.

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