What are the major characteristics of the universe as we know them today? First, there are approximately 10 11 galaxies in the observable part of the universe. ![]() And the nature of the universe has implications for unexplored regions of particle physics.Ĭosmology is the study of the character and evolution of the universe. Today, the patterns in particle physics seem to be explaining the evolution and character of the universe. ![]() Fusion of nuclei likewise explains the energy of stars. Decays of tiny nuclei explain the hot interior of the Earth. Minute atoms and molecules explain the chemistry of substances on a much larger scale. Newton realized that the nature of gravity on Earth that pulls an apple to the ground could explain the motion of the moon and planets so much farther away. Ofek (Caltech))Īs has been noted in numerous Things Great and Small vignettes, this is not the first time the large has been explained by the small and vice versa. What are they like, these myriad stars? How did they evolve? What can they tell us of matter, energy, space, and time? (credit: NASA, ESA, K. Trillions of stars linked by gravity in fantastic forms, glowing with light and showing evidence of undiscovered matter. ![]() Take a moment to contemplate these clusters of galaxies, photographed by the Hubble Space Telescope.
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