accretion disc
121Gauchissement de la Voie Lactée — Le gauchissement de la Voie Lactée est connu depuis 1957[1],[2], lors des premières observations de la raie d hydrogène neutre à 21 cm. Il constitue en une déviation d une partie de la matière de la Voie Lactée de son plan (voir la deuxième… …
122TERRE — Avant d’être un concept, la Terre fut une donnée: d’abord, la Terre nourricière – autrement dit, la «terre végétale» –, puis, la Terre où l’homme vit, par opposition à la mer, c’est à dire les terres émergées. Tout naturellement, cette Terre,… …
123Asteroid belt — For the album by Velvet Chain, see Asteroid Belt (album). The asteroid belt (shown in white) is located between the orbits of Mars and Jupiter. The asteroid belt is the region of the Solar System located roughly between the orbits of the planets… …
124Star formation — is the process by which dense parts of molecular clouds collapse into a ball of plasma to form a star. As a branch of astronomy star formation includes the study of the interstellar medium and giant molecular clouds as precursors to the star… …
125Neptune — This article is about the planet. For other uses, see Neptune (disambiguation). Neptune   …
126Definition of planet — Photograph of the crescent planet Neptune (top) and its moon Triton (center) …
127Canis Major Dwarf Galaxy — Infobox Galaxy name = Canis Major Dwarf epoch = J2000 type = Irr ra = RA|07|12|35.0cite web title=NASA/IPAC Extragalactic Database work=Results for Canis Major Dwarf url=http://nedwww.ipac.caltech.edu/cgi bin/nph… …
128Callisto (moon) — Callisto View of the heavily cratered terrain of Callisto s anti Jovian hemisphere obtained in 2001 by NASA s Galileo spacecraft. The large impact structure Asgard is on the limb at upper right. The prominent rayed crater below and just right of… …
