Edwin Hubble Edwin Hubble Edwin Powell Hubble (November 20, 1889 – September 28, 1953) was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology and is regarded as one of the most important astronomers of all time. Hubble discovered that many objects previously thought to be clouds of dust and gas and classified as "nebulae" were actually galaxies beyond the Milky Way. He used the strong direct relationship between a classical Cepheid variable's luminosity and pulsation period (discovered in 1908 by Henrietta Swan Leavitt) for scaling galactic and extragalactic distances. Hubble provided evidence
Beyond the Limits Beyond the Limits Beyond the Limits is a 1992 book continuing the modeling of the consequences of a rapidly growing global population that was started in "Limits to Growth". Donella Meadows, Dennis Meadows, and Jørgen Randers are the authors and all were involved in the original Club of Rome study as well. "Beyond the Limits" (Chelsea Green Publishing Company) and Earthscan addressed many of the criticisms of the "Limits to Growth" book, but still has caused controversy and mixed reactions. Billionaire investor Richard Rainwater indicates having been influenced by reading "Beyond the Limits"'. His niece Kelley Rainwater reports she gave