<p style="text-align: center;"></p> <p>Data from NASA’s Chandra X-ray Observatory has revealed faint remnants of a supernova explosion and helped researchers determine Circinus X-1 — an X-ray binary — is the youngest
<p style="text-align: center"></p> <p>NASA’s Cassini spacecraft has obtained the highest-resolution movie yet of a unique six-sided jet stream, known as the hexagon, around Saturn’s north pole.</p> <p>This is the first hexagon movie
<p style="text-align:center"></p> <p>Using the powerful eye of NASA’s Hubble Space Telescope, two teams of scientists have found faint signatures of water in the atmospheres of five distant planets.</p> <p>The presence of atmospheric
AAVSO Alert Notice 491<br /> V556 Serpentis = Nova Ser 2013 = PNV J18090346-1112345<br /> December 2, 2013 <p><strong>Event:</strong> V556 Serpentis = Nova Ser 2013 = PNV J18090346-1112345</p> <p><strong>Discovered by:</strong> Koichi Itagaki (Teppo-cho, Yamagata,