![]() Image shows the diffuse infrared background, anisotropy, and spectrum result from COBE. With this orbit and spin-axis orientation, the instruments performed a complete scan of the celestial sphere every six months. The operational orbit was dawn-dusk Sun-synchronous so that the Sun was always to the side and thus was shielded from the instruments. The orientation of the spin axis was maintained anti-Earth and at 94 degrees to the Sun-Earth line. The satellite rotated at 1 rpm about the axis of symmetry to control systematic errors in the anisotropy measurements and to allow observations of the zodiacal light at various solar elongation angles. The base module contained the attitude control, communications and power systems. The experiment module contained the instruments and a dewar filled with 650 liters of 1.6 K liquid helium, with a conical Sun shade. ![]() These variations are believed to have given rise to the structures that populate the universe today: clusters of galaxies, as well as vast, empty regions. These minute temperature variations (depicted here as varying shades of blue and purple) are linked to slight density variations in the early universe. The cosmic microwave background radiation is a remnant of the Big Bang. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |