He was a gifted astronomer whose original theories and powers of mathematical analysis took his science a long way forward; he was a brilliant expositor of physics and astronomy, able to communicate the most difficult conceptions in the simplest and most fascinating language; and he was an able interpreter to philosophers of the significance of the latest scientific discoveries.
Siya ay isang likas na matalino astronomer na ang orihinal na theories at kapangyarihan ng matematikal na pagsusuri kinuha ang kanyang mga agham ng isang mahabang paraan forward; siya ay isang napakatalino expositor ng physics at astronomy, makapag-usap ang mga pinaka-mahirap conceptions sa pinakasimpleng at pinaka-kaakit-akit na wika; at siya ay isang maka interpreter sa philosophers ng kabuluhan ng mga pinakabagong pang-agham discoveries.