27 December 2016

Vera Rubin, who did pioneering work on dark matter, dies

In this image taken in the 1970s and provided by the Carnegie Institution of Washington, Vera Rubin uses a measuring engine. Rubin, a pioneering astronomer who helped find powerful evidence of dark matter died Sunday, Dec. 25, 2016. She was 88.
Vera Rubin, a pioneering astronomer who helped find powerful evidence of dark matter, has died, her son said Monday.

She was 88.
Allan Rubin, a professor of geosciences at Princeton University, said his mother died Sunday night of natural causes. He said the Philadelphia native had been living in the Princeton area.
Vera Rubin found that galaxies don't quite rotate the way they were predicted, and that lent support to the theory that some other force was at work, namely dark matter.

Cheetah numbers decline as African habitat shrinks

In this Aug. 22, 2012 photo, a cheetah is photographed in the Tamboti Game Resrve, near Lephalale, South Africa. Amid population declines for many wildlife species in Africa, conservationists are sounding alarm bells for the cheetah, the fastest animal on land, where there are an estimated 7,100 cheetahs remaining across Africa and in a small area in Iran.
Amid population declines for many wildlife species in Africa, conservationists are sounding alarm bells for the cheetah, the fastest animal on land.
An estimated 7,100 cheetahs remain in the wild across Africa and in a small area of Iran, and human encroachment has pushed the wide-ranging predator out of 91 percent of its historic habitat, according to a study published on Monday.