... A non-linear relationship is observed between the sky brightness on clear and overcast nights, with a change in behavior near the rural to urban landuse transition. ... The great variation in skyglow radiance observed from site-to-site and with changing meteorological conditions underlines the need for a long-term international monitoring program. he introduction of artificial light has caused an unprecedented disruption to the nighttime environment over large areas of the Earth. ... Data processing...

... Interstellar Molecular Clouds . E. Samuel Palmer - Harvard Smithsonian Center for Astrophysics . ... This telescope can see and interpret interstellar CO, a molecular mass tracer for what it can’t see, that is, molecular hydrogen which constitutes most of the mass in giant molecular clouds. ... Covering all the bases, he is also a fellow amateur astronomer, observing the handful of stars occasionally visible from his home in Arlington. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... At the January meeting we finally achieved the necessary quorum in the vote on the bylaws changes proposed in September. ... Giant Ribbon at Edge of the Solar System: Mystery Solved? ... It is where solar wind particles heading out into interstellar space are reflected back into the solar system by a galactic magnetic field." ... Particles from the solar wind that escape the solar system are met ~100 astronomical units (~15 billion kilometers) away by an interstellar magnetic field. ...

SP ACE CENTER April 2004 L YNDON B. JOHNSON SP ACE CENTER Houston, Texas Volume 43 Number 4 In This Issue Director's Message 2 Expedition 9 Crew Profile 3 Putting the pieces together 4-5 WSTF Overview 6 Stardust 7 JSC at the rodeo 8 as17-148-22727 The big blue marble This view of the Earth was seen by the Apollo 17 crew as they traveled toward the Moon on their NASA lunar landing mission. ... One dreamed of flying in space at the age of 3; the other didn't give space much thought until later in life. ...

... 13, Moscow, 119992 Russia 2 Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachai-Cherkessian Republic, 369167 Russia Received May 18, 2009 Abstract--Using the method of two-dimensional spectroscopy, we have investigated the kinematics and distribution of the gas and stars at the center of the early-type spiral galaxy NGC 7177 with a mediumscale bar as well as the change in the mean age of the stellar population along the radius. ...

... May 1998 Date Field Exposure NObj Comments 980519 sgp171 3x1200s 87 980523 sgp173 5x1200s 96 980523 sgp172 3x1200s 82 June 1998 Date Field Exposure NObj Comments 980618 sgp248 6x1200s 119 clear ,1.8arcsec 980626 sgp208 3x900s 70 ended in twilight Sept 1998 Date Field Exposure NObj Comments 980913 sgp249 4x900s 136 (s1) Clear , 2arcsec 980913 sgp180 3x1200s 104 980913 sgp181 3x1200s 91 (s1) 980913 sgp182 ...