Black Holes

Black Holes

Hubble probed the dense, central regions of galaxies and helped astronomers discover dark energy. This mysterious energy exerts a repulsive force that works against gravity. Although astronomers cannot see dark matter, they can detect its influence in galaxy clusters by observing how its gravity bends and distorts the light of more distant background galaxies, a phenomenon called gravitational lensing.

Hubble provided decisive evidence that supermassive black holes reside in the centers of almost all large galaxies. Giant black holes are compact “monsters” weighing millions to billions the mass of our Sun. These elusive “eating machines” cannot be observed directly, because nothing, not even light, escapes their clutches. The Hubble Telescope helped astronomers determine the masses of several black holes by measuring the velocities of material whirling around them. ... Full Text


Astrobiology is the study of the origin, evolution, distribution, and future of life in the universe. This multidisciplinary field encompasses the search for habitable environments in our Solar System and habitable planets outside our Solar System, the search for evidence of prebiotic chemistry and life on Mars and other bodies in our Solar System, laboratory and field research into the origins and early evolution of life on Earth, and studies of the potential for life to adapt to challenges on Earth and in space.. ... Full Text

Air Conditioning and Refrigeration Industry (Ads)

An extensive online resource for Heating, Ventilation, Air Conditioning and Refrigeration Industry. You can search for resources by using our directory index of product and service categories, company and organization names, and locations. ... Aircons

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