... Tonight's Sky . ... Astronomy for Kids . ... CERN experiment makes spectroscopic measurement of antihydrogen . ... The ALPHA collaboration at CERN reports an important milestone on the way to measuring the properties of antimatter atoms. ... This measurement shows that it is possible to set up experiments in which the internal properties of antihydrogen atoms can be changed by shining microwaves on them. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

... B. Bertotti, R. Ambrosini, S.W. Asmar, J.P. Brenkle, G. Comoretto, G. Giampieri, L. Iess, A. Messeri, H.D. Wahlquist: "The Gravitational Wave Experiment" , Astronomy and Astrophysics Suppl. ... B. Bertotti, R. Ambrosini, J.W. Armstrong, S.W. Asmar, G. Comoretto, G. Giampieri, L. Iess, Y. Koyama, A. Messeri, A. Vecchio, H.D. Wahlquist: "Search for gravitational wave trains with the spacecraft Ulysses" , Astronomy and Astrophysics, 296 , 13 (1995). ...

... One of the problems of improving the accuracy of G is a precision measurement of the period of eigen oscillations of the torsion balance. ... A new method of high-precision estimation of the period of torsion oscillations has been developed. The dependence of the torsion period value and the error of its estimation on the level of the acting seismic noise has been studied. ... The accuracy of period estimations depends on the level of seismic noise which affects the torsion balance. ...

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

GRAVITATIONAL REDSHIFT EXPERIMENT WITH THE SPACE RADIO TELESCOPE RADIOASTRON Dmitry Litvinov1, Norbert Bartel 2, Alexander Biriukov3, Vladimir Kauts3, Victor Kulagin1, Valentin Rudenko1 1 Sternberg Astronomical Institute, Russia 2 3 York University, Canada Astro Space Center, Russia Journees 2014 , Saint-Petersburg , 22-24 September 2014 GRAVITATIONAL REDSHIFT Einstein, 1911: Pound, Rebka, 1960: laboratory test Journees 2014 , ... 2014, Astron. ...

Next: Extragalactic Gravitational Wave Background Previous: Transparency of the Stochastic . Let the sky be observed with a detector having a pencil beam diagram across. The number of stars per frequency decade that is swept by the detector is a function of celestial coordinates (say, galactic coordinates l , b ): . ... It is clear from the figure that for an all-sky detector the Galaxy becomes transparent above the frequency  Hz. ...

... Archives . ... Diab Jerius follows up on LOESS techniques б with a very nice summary update and finds LOCFIT to be very useful, but there are still questions about how it deals with measurement errors and combining observations from different experiments: . ... LOESS has been succeeded by LOWESS and, finally LOCFIT, which is the 800lb gorilla of local regression fitting. The LOCFIT algorithm uses local regression (i.e. fits over samples of the data) to generate smooth curves. ... Chandra Blog . ...

The technical memorandum: Time and Time Interval Measurement with Application to Computer and Network Performance Evaluation (PostScript) describes a number of techniques for conducting experiments typical of computer network and transmission systems engineering. ... The usual data collected during a performance run of some experiment might include time offsets, time delays, frequency offsets and various error statistics. ...

... Geoforschungszentrum Potsdam, Aussenstelle Observatorium Niemegk, Germany Magnetic and electric fields and plasma waves are generally thought to play a significant role in various processes. ... The wave instruments included hihgly sensitive sensors for measurements of fluctuations of the plasma flow, current density, electric and magnetic fields, spacecraft potential, density and temperature of the plasma and multi-channell frequency analyzers [Klimov et al., ... Magnetic field measurements . ...

... The described algorithm is suitable for measurements of complex images of stars. ... a) the zero-based number of stars in the complex (multicentric) image, . b) set of preliminary coordinates - x i , y i , for all stars, index i is number of a star, . ... i - index of a star in the complex image; . ... These parameters are calculated by a nonlinear method of a least squares.The main output parameters of this algorithm are x i , y i ; where the index i is number of a star in the multicentric image. ...

... S.P. KOROLEV ROCKET AND SPACE CORPORATION ENERGIA . ... OAO RSC "Energia" . ... Company's History . ... History . Brief History of Rocket and Space Technology . ... Flights Chronology . ... Project History . ISS Russian Segment . Steps of ISS Assembly . Spaceflights Chronology . Chronology of Extravehicular Activity . ISS 45/46 . ... Rocket Space Complexes . ... Launches Chronology . ... Automatic Space Systems . ... HISTORY . ... 2015 JSC "S.P. Korolev RSC "Energia" . ...

At Punta Salinas (North-coast, close to EL-Morro (6.2 km West) in Old San Juan), the Puerto Rico Air National Guard (140th Air Defense Squadron) have a frequency hopping radar with 18 channels spread over the frequency range of 1220 - 1400 MHz. ... For the most part, this scheduling has provided minimal interference to observations that could be hampered by this radar. When coordinated with Punta Salinas observations given adequate protection. AN/FPS-117 RADAR used at Punta Salinas PRANG. ...