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The galactic plane is the plane on which the majority of a disk-shaped galaxy's mass lies. The directions perpendicular to the galactic plane point to the galactic poles. In actual usage, the terms galactic plane and galactic poles usually refer specifically to the plane and poles of the Milky Way, in which Planet Earth is located.
The galactic plane is inclined at an angle of 31° ± 7° to the line of sight to the Earth and the long axis is oriented along a position angle of 219° ± 4°. [4] The northwest side of the galaxy is more strongly obscured by dust, suggesting it is the near side. [12]
The galactic coordinate system uses the approximate plane of the Milky Way Galaxy as its fundamental plane. The Solar System is still the center of the coordinate system, and the zero point is defined as the direction towards the Galactic Center. Galactic latitude resembles the elevation above the galactic plane and galactic longitude ...
The VSS Unity space plane is set to carry its first full crew to the edge of space on Sunday. The launch is now set for 10:30 am ET. Virgin Galactic is livestreaming the whole thing.
GRO J1655−40 and its companion are moving through the Milky Way at around 112 km/s (250,000 miles per hour), in a galactic orbit that depends on its exact distance, but is mostly interior to the "Solar circle", d~8,500 pc, and within 150 pc (~500 ly) of the galactic plane.
The origin essentially coincides with the Earth, because the supergalactic plane is identified as a plane observed from Earth. The north supergalactic pole (SGB = 90°) lies in the constellation Hercules at galactic coordinates (l z = 47.37°, b z = +6.32°), or approximately RA = 18.9 h, Dec = +15.7°.
Relative to the celestial equator, it passes as far north as the constellation of Cassiopeia and as far south as the constellation of Crux, indicating the high inclination of Earth's equatorial plane and the plane of the ecliptic, relative to the galactic plane. The north galactic pole is situated at right ascension 12 h 49 m, declination +27.4 ...
A galactic orientation describes the spatial orientation of a galactic plane, where such exists for a given galaxy. For a spiral galaxy , this can be obtained from the inclination of the galactic plane to the plane of the sky , and the position angle of the major axis as viewed from Earth.