SANTIAGO, May 28 (Xinhua) -- Construction of the world's largest optical telescope has started in northern Chile, marking the dawn of a new era of astronomy. The Extremely Large Telescope (ELT) is being built by the European Southern Observatory (ESO), an intergovernmental astronomy organization...
For example, a large meteorite strike 66 million years ago sent up a plume of ash which is found as a layer of sediment in rocks around the world. The plume is thought to have led to the extinction of a large proportion of the life on the planet, including many dinosaur species. Howev...
摘要: A glass disk, 7 feet in diameter and 13 inches thick, is destined to become the primary mirror for the largest telescope in the Southern Hemisphere. It was made by Corning Glass Works and shipped to the University of La Plata, Buenos Aires.关键词:...
Dr. Hone added: "It is great that we can identify Cryodrakon as being distinct to Quetzalcoatlus as it means we have a better picture of the diversity and evolution of predatory pterosaurs in North America." Unlike most pterosaur groups, azhdarchids are known primarily from terrestrial settings...
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The Sahara desert is the largest hot desert in the world, covering nearly all of northern Africa.
a望远镜,通过光学成像的方法使人看到远处的物体,并且显得大而近的一种仪器 The telescope, causes the human through optics image formation method to see the distant place the object, and appears big and the near one kind of instrument[translate] ...
The Rideau Canal is the oldest continuously operated canal system in North America. At the very beginning,the purpose of the Rideau Canal was military, as it was intended to provide a secure supply and communication route between Montreal and the British naval base in Kingston. It remains in ...
Moose are large ungulates (hoofed mammals) identified by their long, rounded snouts; huge, flattened antlers; humped back; thin legs; and massive bodies. These animals live in the northern United States, Canada and Europe. In North America, they are called moose; in Europe, they are called ...
A week before Christmas, Alaska's largest city should look like a postcard wonderland, and the last place you'd expect to see equipment making snow.