I n modem times, science has brought the past-and so many of its creatures-back to life via intellectual inquiry, application of the scientific method, and some extraordinary technology that has recently been devel oped. The wonder of the process is that such a rich and vivid understanding of the deep past has been generated from such scanty evidence: broken bones, lithified shells, fossil leaves, and even simple layered rocks. The sci entists who have contributed to this work have woven r...

In November 12, 2002, Dr. John Chambers of the NASA Ames Research Center gave a seminar to the Astrobiology Group at the University of Washington. The audience of about 100 listened with rapt attention as Chambers described results from a computer study of how planetary systems form. The goal of his research was to answer a deceptively simple question: How often would newly forming planetary systems produce Earth-like planets, given a star the size of our own sun? By “Earth-like” Chambers ...

Sea level rise will happen no matter what we do. Even if we stopped all carbon dioxide emissions today, the seas would rise one meter by 2050 and three meters by 2100. This -- not drought, species extinction, or excessive heat waves -- will be the most catastrophic effect of global warming. And it won't simply redraw our coastlines -- agriculture, electrical and fiber optic systems, and shipping will be changed forever. As icebound regions melt, new sources of oil, gas, minerals, and arabl...