Résultats pour "Down" dans Physique

Uranium is best known for the destructive power of the atom bombs, which ushered in the nuclear era at the end of World War II, but given the effectiveness of nuclear power, nuclear power plants were constructed around the developed world during the second half of the 20th century. While nuclear power plants were previously not an option and thus opened the door to new, more efficient, and more affordable forms of energy for domestic consumption, the use of nuclear energy understandably unnerved people living during the Cold War and amidst ongoing nuclear detonations.

Scientists tell us that ninety-six percent of the universe is unexplained dark matter and dark energy. Also, they admit that no unifying “theory of everything” exists in physics. This shaky foundation is the basis of modern thinking about the cosmos and Earth’s place in it. Something big seems to be missing. Thus, we’re left with no choice but to question the “consensus” cosmological model. Are we really flying through space on a spinning ball within an expanding universe, while free-falling around the Sun—all as a consequence of a “Big Bang” that supposedly occurred 13.8 billion years ago?

From the pioneers of Los Alamos who got up close and personal with the cores of atomic bombs, to the hapless engineers in Soviet fuel-processing plants who unwittingly mixed up a disaster in a bucket, and from the terrifying impact of a tsunami at Fukushima to the mystery of the recent Russian incident, Meltdown explores the past and future of this extraordinary and potentially lethal source of infinite power

In Countdown, science journalist Sarah Scoles uncovers a different atomic reality: the nuclear age's present. Drawing from years of on-the-ground reporting at the nation's nuclear weapons labs, Scoles interrogates the idea that having nuclear weapons keeps us safe, deterring attacks and preventing radioactive warfare. She deftly assesses the existing nuclear apparatus in the United States, taking listeners beyond the news headlines and policy-speak to reveal the state of nuclear-weapons technology.

Journalist Pat Duggins, National Public Radio's resident "space expert", chronicles the planning stages of the Space Shuttle program in the early 1970s, the thrill of the first flight in 1981, construction of the International Space Station in the 1990s, and the decision in the early 2000s to shut the program down.

In Earth-Shattering, astronomy writer Bob Berman guides us through an epic, all-inclusive investigation into these instances of violence both mammoth and microscopic. From the sudden creation of dazzling "new stars" to the furiously explosive birth of our moon, from the uncomfortable truth about ultra-high-energy cosmic rays bombarding us to the incredible ways in which humanity has harnessed cataclysmic energy for its gain, Berman masterfully synthesizes some of our worst fears into an astonishing portrait of the universe.

What is our concept of a millennium and how has its meaning shifted? When did the new millennium begin? And why must our calendars be so complex, anyway? Best-selling author Stephen Jay Gould applies his wit and erudition to explore these questions, which cover one of today's most pressing subjects.

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