Sort by

Loading results ...

Showing 271 - 280 of 374 Results
Universe
Oct 22, 2008

class of shorter-lived GRBs is still a mystery, but that's another story. The first waves of star formation after the Big Bang should have produced plenty of metal-poor...

Sun, Solar System
Jun 22, 2005

improbably thin. If you made a 1-meter-wide scale model of Saturn, the rings would be 10,000 times thinner than a razor blade. They're full of strange waves and spokes and...

Sun
Mar 12, 2010

. [larger image] Could it be that sunspots are not rooted to the bottom of the Conveyor Belt, after all? "That's one possibility" he notes. "Sunspots could be moving because...

Aug 31, 2007

observations are needed to decide its ultimate success or failure." Tappe is doing his part with a new round of Spitzer observations: "We're mapping the distribution of PAHs...

Universe, Solar System
May 14, 2008

State University in Raleigh, who led the Chandra study. "Fortunately, the expanding gas cloud from the explosion shines brightly in radio waves and X-rays for thousands of...

Sun
Sep 30, 2008

. Questions about effects on climate are natural if the sun continues to dim." Pesnell is NASA's project scientist for the Solar Dynamics Observatory (SDO), a new spacecraft...

Jun 19, 2000

from one rotational energy state to another, they emit radio waves at precise frequencies. The "family" of radio frequencies emitted by a particular molecule forms a unique "...

Universe, Solar System
Nov 5, 1999

atmosphere they heat and ionize the air in their path. The luminous ionized trails are not only visually striking (if seen at night) but they also reflect radio waves. During...

Universe
Dec 11, 1998

objects that emitted radio waves with clock-like precision.   Left: A sky map showing the approximate location of this discovery (J1946+274). The pulsar and its...

Jul 13, 1997

material is pure and undisturbed. Measuring how viscosity ("You squeeze the metal and watch how the waves damp out") and surface tension (the same effect that lets bugs walk...

Pages