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Photomontage constellation du Cygne/carte. La constellation du Cygne culmine au zenih en Europe durant les nuits d'ete. Traversee par la Voie Lactee, c'est une des belles constellation du ciel boreal. On distingue en haut r gauche l'etoile Deneb et la nebuleuse North America ( NGC 7000 ), et prcs du bord gauche de l'image les restes de supernova appelees "dentelles du Cygne". Cette image a ete realisee au moyen d'un objectif de 50 mm.
Milankovitch cycles are the collective effect of changes in the Earth's movements upon its climate, named after Serbian civil engineer and mathematician Milutin Milankovic. The eccentricity, axial tilt, and precession of the Earth's orbit vary in several patterns, resulting in 100,000-year ice age cycles of the Quaternary glaciation over the last few million years. The Earth's axis completes one full cycle of precession approximately every 26,000 years. At the same time, the elliptical orbit rotates, more slowly, leading to a 21,000-year cycle between the seasons and the orbit. In addition, the angle between Earth's rotational axis and the normal to the plane of its orbit moves from 22.1 degrees to 24.5 degrees and back again on a 41,000-year cycle. Currently, this angle is 23.44 degrees and is decreasing.
The giant planet, 51 Pegasus, bakes under the heat of its parent star. Lightning flashes in its atmosphere and auroral displays shimmer over the polar regions, a possibility if it has a magnetic field. Any moons, such as the captured asteroid in the foreground, would glow red hot from the temperatures of nearly 1800 degrees Fahrenheit.