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Hace 2 días · Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance between the two varies between 8.2 and 31.5 astronomical units as they orbit every 50 years.
Hace 2 días · Stellarium Web is a planetarium running in your web browser. It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.
Hace 2 días · Motion transverse to the line of sight causes the position of Vega to shift with respect to the more distant background stars. Careful measurement of the star's position allows this angular movement, known as proper motion, to be calculated.
Hace 2 días · The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding galaxy. The components of motion of a star consist of the radial velocity toward or away from the Sun, and the traverse angular movement, which is called its proper motion.
Hace 3 días · History of film - Hollywood Studio System: If the coming of sound changed the aesthetic dynamics of the filmmaking process, it altered the economic structure of the industry even more, precipitating some of the largest mergers in motion-picture history.
Hace 5 días · Generally speaking (with the exception of the very early type stars), the solar motion velocity increases with decreasing temperature of the stars, ranging from 16 km/sec for late B-type and early A-type stars to 24 km/sec for late K-type and early M-type stars.
Hace 3 días · The Gaia Spacecraft carries a payload of three instruments to complete its star-mapping mission: The Astrometric Instrument determines the positions of stars in the sky and provides data to track their motion and parallax. The Radial Velocity Spectrometer determines the velocity of a star along the line of sight of Gaia using doppler shift ...
