91 research outputs found
L'espace et le temps : le point de vue astronomique
No full textSchatzman Evry, Signore Monique. L'espace et le temps : le point de vue astronomique. In: Communications, 41, 1985. L'espace perdu et le temps retrouvé, sous la direction de Rémy Lestienne et Edgar Morin. pp. 81-94
Limitations to the accuracy of cosmic background radiation anisotropy measurements: Atmospheric fluctuations
No full textWe discuss the ultimate limits posed by atmospheric fluctuations to observations of cosmic background anisotropies (CBAs) in ground-based and balloon-borne experiments both in the radio and millimetric regions. We present correlation techniques useful in separating CBAs from atmospheric fluctuations. An experimental procedure is discussed for testing a site in view of possible CBA observations. Four sites with altitudes ranging from 0 up to 3.5 km have been tested
In morte dell'illvstre signore, il sig. Bartolomeo Concini, primo segretario del Gran Duca di Toscana : canzone /
No full textMarescotti's woodcut device on t.p. (ship). Two headpieces, one with view of Florence; tailpiece. One historiated and one decorated initial.Mode of access: Internet.Binding: modern marbled paper. Author, title and imprint written on front cover along spine. Pen trials and brief inscriptions on t.p. verso and last leaf
The Rome Paris collaboration
No full textInternational audienceSince the first "Twinning CEE Project" between the Group of Francesco Mechiorri and our Laboratory at Observatoire de Paris and Ecole Normale Supérieure, and then through several European Networks and NASA Collaborations on the Cosmic Microwave Background, a long-term and fruitful cooperation has existed between Rome and Paris. This contribution will focus on the human story, the principal results and the possible prospects of this wonderful collaboration
Il Signore Risorto – la Gioia del Vangelo (GV 20, 20b)
No full textThe author analyses exegetically J 20, 19–20 where the disciples were filled with joy when they saw Risen Jesus. Starting from the analysis of the literary context and the motives related to the disciples’ joy, the author stresses church-centered role of the Risen Lord (kyrios). He points out a number of references to the appearances of Risen Christ in Luke 24, which seem to have many points in common with the Johannine tradition. He particularly focuses on the very moment of appearance when Jesus in a symbolic gesture shows his hands and side to the disciples. The hands and side are the symbols of tender love of the Good Shepherd and inexhaustible source of the Holy Spirit. Moreover, he presents the contrast between the experience of fear, confusion and scattering (before the Resurrection) and the experience of joy, confidence and unity which was rediscovered around the Risen Jesus.L’articolo presenta un’analisi esegetica di Gv 20, 19–20, dove gli apostoli si rallegrarono al vedere Gesù risorto. Si esamina il contesto letterario, i motivi inerenti alla gioia dei discepoli e il ruolo ecclesiocentrico del Signore Risorto (kyrios). Non mancano riferimenti al racconto delle apparizioni in Lc 24, che sembra molto vicino alla tradizione giovannea. Un’attenzione particolare viene data al momento dell’apparizione, quando Gesù, eseguendo un gesto simbolico, mostra ai discepoli le mani e il costato, entrambi i simboli della amorevole cura del Buon Pastore e dell’inesauribile fonte dello Spirito Santo. Inoltre, viene messo in risalto il contrasto tra lo stato di paura, smarrimento e dispersione (prima dell’apparizione del Risorto) e lo stato di gioia, fiducia e ritrovata unità attorno a Gesù Risorto
Cosmic microwave background and first molecules in the early universe
No full textInternational audienceBesides the Hubble expansion of the universe, the main evidence in favor of the big-bang theory was the discovery, by Penzias and Wilson, of the cosmic microwave background (hereafter CMB) radiation. In 1990, the COBE satellite (Cosmic Background Explorer) revealed an accurate black-body behavior with a temperature around 2.7 K. Although the microwave background is very smooth, the COBE satellite did detect small variations—at the level of one part in 100 000—in the temperature of the CMB from place to place in the sky. These ripples are caused by acoustic oscillations in the primordial plasma. While COBE was only sensitive to long-wavelength waves, the Wilkinson Microwave Anisotropy Probe (WMAP)—with its much higher resolution—reveals that the CMB temperature variations follow the distinctive pattern predicted by cosmological theory. Moreover, the existence of the microwave background allows cosmologists to deduce the conditions present in the early stages of the big bang and, in particular, helps to account for the chemistry of the universe. This report summarizes the latest measurements and studies of the CMB with the new calculations about the formation of primordial molecules. The PLANCK mission—planned to be launched in 2009—is also presented
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