The Greatest Gain From Space Travel Consists

I Only Hope That We Shall Not Wait To Adopt The Program Until After Our Astronomers Have Reported A New And Unsuspected Asteroid Moving Across Their Fields Of Vision With Menacing Speed. At That Point It Will Be Too Late!

Nature Does Not Know Extinction; All It Knows Is Transformation. ... Everything Science Has Taught Me-and Continues To Teach Me-strengthens My Belief In The Continuity Of Our Spiritual Existence After Death. Nothing Disappears Without A Trace.

A Good Engineer Gets Stale Very Fast If He Doesn't Keep His Hands Dirty.

Science Does Not Have A Moral Dimension. It Is Like A Knife. If You Give It To A Surgeon Or A Murderer, Each Will Use It Differently.

The First Men Who Set Out For Mars Had Better Make Sure They Leave Everything At Home In Apple-pie Order. They Won't Get Back To Earth For More Than Two And A Half Years. The Difficulties Of A Trip To Mars Are Formidable. . . . What Curious Information Will These First Explorers Carry Back From Mars? Nobody Knows-and Its Extremely Doubtful That Anyone Now Living Will Ever Know. All That Can Be Said With Certainty Today Is This: The Trip Will Be Made, And Will Be Made . . . Someday.