TOP 100 CAMPING SITES
| ||||||||||||||||||||||||||||||||||||||||||||||||
|
| ||||||||||||||||||||||||||||||||||||||||||||||||
|
| |||||||||||||||||||||||||||||||||||||||||||||||
|
| ||||||||||||||||||||||||||||||||||||||||||||||||
| The Origin of the Universe (preview) The universe is big in both space and time and, for much of humankind’s history, was beyond the reach of our instruments and our minds. That changed dramatically in the 20th century. The advances were driven equally by powerful ideas--from Einstein’s general relativity to modern theories of the elementary particles--and powerful instruments--from the 100- and 200-inch reflectors that George Ellery Hale built, which took us beyond our Milky Way galaxy, to the Hubble Space Telescope, which has taken us back to the birth of galaxies. Over the past 20 years the pace of progress has accelerated with the realization that dark matter is not made of ordinary atoms, the discovery of dark energy, and the dawning of bold ideas such as cosmic inflation and the multiverse.The universe of 100 years ago was simple: eternal, unchanging, consisting of a single galaxy, containing a few million visible stars. The picture today is more complete and much richer. The cosmos began 13.7 billion years ago with the big bang. A fraction of a second after the beginning, the universe was a hot, formless soup of the most elementary particles, quarks and leptons. As it expanded and cooled, layer on layer of structure developed: neutrons and protons, atomic nuclei, atoms, stars, galaxies, clusters of galaxies, and finally superclusters. The observable part of the universe is now inhabited by 100 billion galaxies, each containing 100 billion stars and probably a similar number of planets. Galaxies themselves are held together by the gravity of the mysterious dark matter. The universe continues to expand and indeed does so at an accelerating pace, driven by dark energy, an even more mysterious form of energy whose gravitational force repels rather than attracts. [More] rss.sciam.com |
Energy Out of the Blue: Generating Electric Power from the Clash of River and Sea Water In the hunt for alternatives to polluting and climate-warming fossil fuels, attention has turned to where rivers meet the sea. Here, freshwater and saltwater naturally settle their salinity difference, a phenomenon that two pioneering projects in Europe will try to harness to generate clean energy. [More] rss.sciam.com |
Man convicted for killing and eating China's last Indochinese tiger The last Indochinese tiger in China was killed and eaten by a man who has now been sentenced to 12 years in prison for his crime. [More] rss.sciam.com |
Hunting for Projects to Help Fish and Wildlife Adapt to Climate Change NEW YORK - For the average United States' city or 'burb dweller, firsthand evidence of climate change is rare. Hunters and anglers see it every day. [More] rss.sciam.com |
Tropical Glaciers in Indonesia May Disappear by the End of the Decade Glaciers in one of the world's last tropical ice caps will be gone within a matter of years , rather than the decades thought previously, according to an Ohio State University researcher who has spent his career probing the world's ice fields. When they go, a unique record of the El Niño-Southern Oscillation phenomenon that drives climate patterns in the tropics could disappear, too, glaciologist Lonnie Thompson said.The cap, perched on a 16,000-foot-high mountain ridge in Indonesia, "was riddled with crevasses and lacked any substantial snowfall," Thompson said of his most recent trip, earlier this summer. [More] Lonnie Thompson - Ohio State University - Indonesia - El Niño-Southern Oscillation - Glaciology rss.sciam.com |