Universe a grand tour of modern science Phần 9 docx

... search for sparticles at Fermilab near Chicago, begun in 199 6, 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 ... the surface. During a total eclipse it appears as the streaky corona that gives the atmosphere its technical name. Telescopes called coronagraphs use a central mask to create an artificial...

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 ... climate intervened. In the late 197 0s the global temperature trend reversed and a rewarming began. A decade after that, Bolin was chairman of an Intergover nmental Panel on Climate Ch...

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 ... y obvious way to establish that 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...

Ngày tải lên: 08/08/2014, 01:20

... 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 Ukraine Vietnam Oxford ... Data Data available Library of Congress Cataloguing in Publication Data Data available Typeset in 11/13pt Dante by SPI Publisher Services, Pondicherry, India Printed in Great Britain on...

Ngày tải lên: 08/08/2014, 01:20

... 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 ... are also seasonal differences in the uptake and release of the gas by seawater. The asymmetry results in a yearly wave in the graph of global carbon dioxide, as measured at Mau...

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 ... science was the role of marine algae as a source of sulphate grains in the air—see Global enzymes. Later came a suggestion that cosmic rays from the Galaxy are somehow involved in...

Ngày tải lên: 08/08/2014, 01:20

... proteins, and animals make greater use of this versatility than plants do. Another is that plants, being stationary, need a wider range of defences than animals that can run away from danger. In comparison ... 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...

Ngày tải lên: 08/08/2014, 01:20

... was a variable Sun, affecting the whole planet. Bond’s team was able to cite widespread changes in the Atlantic reaching to South America and West Africa, already correlated with solar variations ... 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...

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 5 39 plant diseases P otatoes ... large plates account for 94 per cent of the Earth’s surface. In descending order of size they are the Pacific, African, Eurasian, Indo-Australian, North American, Antarct...

Ngày tải lên: 08/08/2014, 01:20

... 2000 Valtaoja: personal communication, 2002 Brain images Landau: W.M. Landau et al., Transactions of the American Neurological Association, vol. 80, pp. 125 9, 195 5 Scandinavian researchers: N. Lassen ... in a museum. There is a Dark Age of a billion years, or perhaps much less than that, between the microwave background and the appearance of the stars and galaxies. Very distant...

Ngày tải lên: 08/08/2014, 01:20