Universe a grand tour of modern science Phần 2 pdf

... satellites. They have masses a few times greater than the Sun’s, and nowadays they are called microquasars. The black hole idea was thus available, ready made, for explaining the quasars and active galaxies ... somewhat laborious. By 20 01, at Spain’s Instituto de Astrofisica de Canarias, Alister Graham and his colleagues realized that you could judge the mass just by looking at a galaxy...

Ngày tải lên: 08/08/2014, 01:20

... the stresses of spaceflight and the wrath of NASA to visit the Space Station in 20 02, as a paying guest of the Russians, he blazed a trail for ordinary mortals. One day the first babies will be ... Toronto With offices in Argentina Austria Brazil Chile Czech Republic France Greece Guatemala Hungary Italy Japan Poland Por tugal Singapore South Korea Switzerland Thailand Turkey Ukra...

Ngày tải lên: 08/08/2014, 01:20

... those back together, abolishing the Atlantic Ocean, and the job is half-done. East of Africa it’s trickier, because Antarctica, India and Australia could fit together in old Gondwana-Land in various ... called them the Altaids, after the magnificent Altai mountain range that runs from Kazakhstan to China. ‘The Tethysides and the Altaids cover nearly a half of the entire continent of E...

Ngày tải lên: 08/08/2014, 01:20

... and improvements of sea defences against tsunamis—the great ‘tidal waves’ that often accompany earthquakes. City by city, district by district, experts calculate the risks of damage and casualties ... potential energy of a stream about to go over a waterfall. The energy associated with a certain speed or temperature was greater in a large mass than in a small one, but only in...

Ngày tải lên: 08/08/2014, 01:20

... in our own backyard, at the oldest stars of the Milky Way Galaxy itself, and at nearby galaxies. Billions of years from now, the Magellanic Clouds and the Andromeda Galaxy may all crash into us. ... arranged with Russian colleagues to have the basalt from many of the West Siberian boreholes dated by argon-argon at a Scottish lab in East Kilbride. Again, it all came out at almost exact...

Ngày tải lên: 08/08/2014, 01:20

... Berkeley announced another walker, around 5.5 million years old, found in Ethiopia. He called it Ardipithecus ramidus kadabba, where kadabba meant ‘basal family ancestor’ in the Afar language of the ... widespread changes in the Atlantic reaching to South America and West Africa, already correlated with solar variations by other scientists. Farther afield, reductions of rainfall in East A...

Ngày tải lên: 08/08/2014, 01:20

... exclusively in Australia. Kangaroos, koalas and all of the typical native mammals of Australia are marsupials. They give birth to very small offspring, which complete their gestation in a body pouch ... one scenario rather than another was what actually happened. Also lacking is clear knowledge about what the planet was like at the time. It was certainly not a tranquil place. Big cr a...

Ngày tải lên: 08/08/2014, 01:20

... possibility of retreat as well as advance, remains a valid basis for thinking generally about co-evolution and its weaponr y. Hamilton’s idea of sex as a means of sharing out 539 plant diseases P otatoes ... feature was the absence of jaguars, pumas, harpy eagles, anteating armadillos and other predators on all of the smallest islands, letting the seed-eating rodents, leaf-cutte...

Ngày tải lên: 08/08/2014, 01:20

... search for sparticles at Fermilab near Chicago, begun in 1996, concluded only that a gluino, if it exists at all, must be at least as heavy as an atom of lead. That was beyond the capacity of ... because of technical problems in 20 01. ‘It was exciting to see the solar weather changing day by day,’ said Saku Tsuneta of the National Astronomical Observatory of Japan. ‘Storms on th...

Ngày tải lên: 08/08/2014, 01:20

... 20 01 National Academy of Sciences: Climate Change Science: An Analysis of Some Key Questions, Washington: National Academy of Sciences, 20 01 Editors of Science: ‘Areas to Watch in 20 03’, Science, vol. 29 8, ... 160–3, 20 00 Valtaoja: personal communication, 20 02 Brain images Landau: W.M. Landau et al., Transactions of the American Neurological Association, vol. 80, pp....

Ngày tải lên: 08/08/2014, 01:20