Physics is not a series of disconnected subjects, including Mechanics, Sound, Light, Heat, and Electricity. It is, on the contrary, a body of well-organized truth, forming one great whole; illustrating, as do few other subjects, what Dickens called "the universal dove-tailedness of things."
It is no secret that our lives are patterned by personal experience, and by our observations of the experience of others. So it is with the entire human family, staring outward from a place that we know to others that we do not. Our knowledge of home helps us to understand the ways of planets beyond our ken.
We should expect to find stars and galaxies in all stages of evolution as they form from existing material and then decay. For stars this is certainly the case.... There may be a similar evolutionary process for galaxies, but at the moment we do not have enough experimental evidence to give us the clues to the evolutionary pattern.
In giving birth to us, the universe has performed its most astonishing creative act. Out of a hot, dense melee of subatomic particles... it has fashioned intelligence and consciousness... Somehow the anarchy of genesis has given way to exquisite, intricate order, so that now there are portions of the universe that can reflect upon themselves..
Among the innumerable celestial objects that may be seen through a telescope, the most beautiful of all is perhaps the planet Saturn. When viewed in the evening twilight while the sky is still bright, the yellow gold ball and its unbelievable rings shimmer in a brilliant blue medium, more like a rare work of art than a natural phenomenon.