<p></p> <p>Scientists may be closer to solving the mystery of how Mars changed from a world with surface water billions of years ago to the arid Red Planet of today.</p> <p>A new
<p style="text-align:center"></p> <p>The next time you step onto an airplane, consider the following: In any given year, the pilot of your aircraft probably absorbs as much radiation as a worker
<p>Every summer, something strange and wonderful happens high above the north pole. Ice crystals begin to cling to the smoky remains of meteors, forming electric-blue clouds with tendrils that
<p>Comets visible to the naked eye are a rare delicacy in the celestial smorgasbord of objects in the nighttime sky. Scientists estimate that the opportunity to see one of these
<p>Comet Pan-STARRS (C/2011 L4) is now inside the orbit of Mercury and it is brightening as it approaches the sun. Observers in the southern hemisphere say the comet can
<p>The annual Quadrantid meteor shower peaks on Wednesday morning, Jan. 4th, when Earth passes through a narrow stream of debris from a comet thought to have broken apart some 500
<table border=0 bordercolor=#000080 cellspacing=5 cellpadding=0> <tr> <td valign=center> </td> <td valign=center> <p><b>May 30</b>: Tiny crystals of a green mineral called olivine are falling down like rain on a burgeoning star, according to observations from <a
<p>NASA’s Cassini spacecraft and a European Southern Observatory ground-based telescope tracked the growth of a giant early-spring storm in Saturn’s northern hemisphere that is so powerful it stretches
<p>During the early hours of August 1st, NASA’s <a href="http://sdo.gsfc.nasa.gov/" target="_blanK">Solar Dynamics Observatory</a> recorded a complex global disturbance on the Earth-facing side of the sun.</p> <p>Most of the sun’s northern hemisphere
<p>Lonely Pluto floats in the darkness at the edge of our solar system. It’s so far away even the Hubble Space Telescope has trouble making out the details. Nevertheless, Pluto