Word: hydrogens
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...certain where the water came from, though a collision with an icy comet is likely. Just as important as the origin of the ice is its future. "Settlers could break the water into oxygen and hydrogen and turn them into rocket fuel and air," suggests Dunston. And as for the possibility of ice-dwelling organisms? Not likely. Water may help sustain life, but at nearly 400[degrees] below, it couldn't get started in the first place...
What drives space weather is the solar wind, a never-ending gush of magnetized gas spewed out by the corona, the sun's glowing outer shell. This gas is so hot (two million degrees Fahrenheit) that atoms of hydrogen and helium are homogenized into a dilute plasma, composed mainly of negatively charged electrons and positively charged protons. Yet the solar wind is a gossamer thing, far less substantial than a whisper. "What you have," marvels Gurman, "is a million tons of matter moving at a million miles per hour. But its density is so low that essentially you're dealing...
Hurtling in from space some 16 million years ago, a giant asteroid slammed into the dusty surface of Mars and exploded with more power than a million hydrogen bombs, gouging a deep crater in the planet's crust and lofting huge quantities of rock and soil into the thin Martian atmosphere. While most of the debris fell back to the surface, some of the rocks, fired upward by the blast at high velocities, escaped the weak tug of Martian gravity and entered into orbits of their own around...
...conscientious enough to take action. After World War II, he actively opposed nuclear testing and the escalating arms race, and was one of 12 scientists who lobbied President Harry S. Truman to promise that the United States would not be the first country to use a hydrogen bomb...
...more undesirable pieces of extraterrestrial real estate. The first, a planet orbiting a star known as 47 Ursae Majoris, 200 trillion miles from Earth in the Big Dipper, is about twice the size of Jupiter. Like our own largest planet, it probably consists mostly of such noxious gases as hydrogen sulfide, ammonia and methane. Fierce jet streams blow unceasingly at hundreds of miles per hour, sometimes spiraling into mammoth hurricanes that last for centuries and are big enough to swallow the Earth. And if this harsh world has any solid surface at all, it's buried under an atmosphere thousands...