![]() ![]() ![]() Or are they? John used both theoretical exploration and astronomical experiments to investigate this question. These are examples of what are often called the constants of nature – fundamental physical quantities that seem to be the same everywhere, and unchanging over time. The gravitational constant, G, is 6.674 x 10-11 m 3kg -1s -2. We wanted to share with you some of the new things John taught us over the years. ![]() Not knowing the answer was not something to be worried about, it was an opportunity to learn something new. And he was even more pleased if the question gave him the opportunity to work out the problem from scratch on the black board. It didn't matter what scientific question we had, John was almost certainly able to answer it himself, or remember someone else who could answer it, and hand you their book, their paper, or their contact details. We were lucky enough to have John as our boss, and to work next door to him, for many years. ![]()
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