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Do you believe in the existence of extraterrestrial life? -Daniel Nebro ADDIS ABABA, ETHIOPIAI am an evolutionist, and since there is no evidence, I don't know. When I was a little kid we only knew about our nine planets. Since then, we've downgraded Pluto but have discovered that...

Author: /time Magazine | Title: 10 Questions for Buzz Aldrin | 9/6/2007 | See Source »

Astronomers are pretty sure that most of the water on Earth - and the water that probably flowed billions of years ago on the surfaces of Mars, and maybe Venus as well - came from icy comets, raining down on the newborn planets. As for where the comets came from, it's...

Author: /time Magazine | Title: Sleet Storm in Space | 8/30/2007 | See Source »

But a new study suggests it's not so simple. Published in the Aug. 30 issue of Nature, the paper shows that the creation of a comet is probably a much more complicated process than anyone thought. The evidence comes from the Spitzer Space Telescope, which uses infrared-sensitive cameras...

Author: /time Magazine | Title: Sleet Storm in Space | 8/30/2007 | See Source »

And onto that disk, a rain of ice crystals is falling, slamming into the disk at supersonic speeds and vaporizing to form a cloud containing five times the water in Earth's oceans. What the astronomers are convinced will happen next is that the water will re-freeze into ice...

Author: /time Magazine | Title: Sleet Storm in Space | 8/30/2007 | See Source »

From the window of his ninth-floor office, Kushal Pal Singh looks down over New Delhi's Jantar Mantar, an elaborate astronomical observatory built by a far-sighted 18th century Hindu ruler. The stone curves and pillars of the observatory worked in conjunction with its massive sundial to measure time...

Author: /time Magazine | Title: Building a Dream | 8/17/2007 | See Source »

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