Robert Jastrow, one of the noted astronomers of our time and, as it happens, a former professor of mine at Dartmouth, died earlier this year. This is my overdue tribute to his life and work.
Jastrow was one of the great popularizers of science. One of his books, Red Giants and White Dwarfs, became a national bestseller and conveyed to a whole generation of Americans the excitment and mystery of space exploration. When American astronauts landed on the moon, Jastrow provided expert commentary for the TV networks covering the event.
But Jastrow never permitted popularization to get in the way of serious professional accomplishment. After getting his doctorate in physics from Columbia, he became head of the theoretical divison at NASA. Later he was appointed head of the Goddard Space Institute. In 1992 he became chairman of Mount Wilson Observatory in California.
In addition to medals for scientific achivement, Jastrow also won acclaim as a gifted teacher. At Dartmouth, I always found him friendly and accessible. Later our paths crossed because Jastrow became an energetic and resourceful defender of President Reagan's strategic missile defense initiative, dubbed by its critics as "Star Wars."
While critics like physicist Hans Bethe said Star Wars would never work, the Russians agreed with Jastrow that it would, and they desperately sought to outlaw it. (Obviously if the Russians felt it was a boondoggle they would have supported it, since this would be a great way to waste America's defense budget.) In his last years Jastrow became increasingly skeptical of claims that global warming is destroying the planet. He saw global warming as an effort to exploit science for ideological ends.
One of Jastrow's gems is a little book called God and the Astronomers in which Jastrow, although himself an agnostic, made a startling argument. He argued that "the astronomical evience leads to a biblical view of the origin of the world." Jastrow not only documents his claim but shows why leading scientists including Einstein resisted the new discoveries, because they threatened the dogma that scientific laws enjoy eternal validity. Jastrow showed that in reality the laws of physics themselves came into existence with the Big Bang; beyond or apart from our universe, there are no such laws.
Jastrow's story reads like a detective novel, with the only difference that the facts he recounts are true. And here is his stunning conclusion: "For the scientist who has lived by his faith in the power of reason, the story ends like a bad dream. He has scaled the mountains of ignorance; he is about to conquer the highest peak; as he pulls himself over the final rock, he is greeted by a band of theologians who have been sitting there for centuries."

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