Waubonsee Community College

Surveying the skies, how astronomers map the universe, Gareth Wynn-Williams

eng

illustrations

index present

non fiction

Surveying the skies

930996907

Gareth Wynn-Williams

Astronomers' universe,, 1614-659X

how astronomers map the universe

Since the time of Galileo, astronomy has been driven by technological innovation. With each major advance has come the opportunity and enthusiasm to survey the sky in a way that was not possible before. It is these surveys of discovery that are the subject of this book. In the first few chapters the author discusses what astronomers learned from visible-light surveys, first with the naked eye, then using telescopes in the seventeenth century, and photography in the nineteenth century. He then moves to the second half of the twentieth century when the skies started to be swept by radio, infrared, ultraviolet, x-ray and gamma ray telescopes, many of which had to be flown in satellites above the Earth's atmosphere. These surveys led to the discovery of pulsars, quasars, molecular clouds, protostars, bursters, and black holes. He then returns to Earth to describe several currently active large-scale projects that methodically collect images, photometry and spectra that are then stored in vast publicly-accessible databases. Dr. Wynn-Williams also describes several recent "microsurveys" - detailed studies of small patches of sky that have led to major advances in our understanding of cosmology and exoplanets.

The naked eye era -- The telescope era -- The photography era -- Radio surveys -- Infrared surveys -- The cosmic microwave background -- Ultraviolet surveys -- X-ray surveys -- Gamma ray surveys -- Space astrometry -- The CCD era -- Microsurveys -- Accessing astronomy surveys -- Appendices