The Whirlpool Galaxy (M51a / NGC 5194): a spiral galaxy 23 million ly distant in the constellation Canes Venatici. The galaxy and its companion (NGC 5195) may be seen with binoculars
The universal constant of gravity, G, is defined. It suffices to define G via Newton's theory since general relativity contains the same constant. It is emphasised that ordinary gravity is attractive, and that this is probably crucial to the creation of the universe and is certainly crucial to the formation of structure. Cosmological constant effects (potentially repulsive) are discussed in Chapters 5B and 5C of the Cosmology Tutorial.
Go to Cosmic Coincidences Next Chapter Abstract
Go to the Cosmic Coincidences Chapter Selection Page
Go to the Cosmology Tutorial page
Go to Rick's Cosmology FAQ
Go back to Rick's Home Page (Main Menu)
Contact me and other links
The Whirlpool Galaxy (M51a / NGC 5194): a spiral galaxy 23 million ly distant in the constellation Canes Venatici. The galaxy and its companion (NGC 5195) may be seen with binoculars