The Milky Way is a barred spiral galaxy, about 100,000 light-years across. We live on one of its minor spurs, the Orion Arm.

The Milky Way is a barred spiral galaxy, about 100,000 light-years across. We live on one of its minor spurs, the Orion Arm.

The Pleiades star cluster as seen from midnorthern latitudes on the evening of April 1, 2006.<br />

The Pleiades star cluster as seen from midnorthern latitudes on the evening of April 1, 2006.<br />

The hand might look like an X-ray from the doctor's office, but it is actually a cloud of material ejected from a star that exploded. NASA's NuSTAR spacecraft has imaged the structure in high-energy X-rays for the first time, shown in blue. Lower-energy X-ray light previously detected by NASA's Chandra X-ray Observatory is shown in green and red.

The hand might look like an X-ray from the doctor's office, but it is actually a cloud of material ejected from a star that exploded. NASA's NuSTAR spacecraft has imaged the structure in high-energy X-rays for the first time, shown in blue. Lower-energy X-ray light previously detected by NASA's Chandra X-ray Observatory is shown in green and red.

NASA's Dawn spacecraft obtained images for this map-projected view of Ceres during its high-altitude mapping orbit, in August and September 2015.<br />

NASA's Dawn spacecraft obtained images for this map-projected view of Ceres during its high-altitude mapping orbit, in August and September 2015.<br />

This very wide-field view of the Milky Way shows the extent of the 84-million-star VISTA infrared image of the center of the galaxy (delineated by red rectangle).<br />

This very wide-field view of the Milky Way shows the extent of the 84-million-star VISTA infrared image of the center of the galaxy (delineated by red rectangle).<br />

View larger. |  Halo display in Red River, New Mexico January 9, 2015.  Photo by Joshua Thomas.

View larger. | Halo display in Red River, New Mexico January 9, 2015. Photo by Joshua Thomas.

Orion in the Canopy - Summit County, Colorado.  Photo posted to EarthSky Facebook in March 2015 by Daniel McVey.  Visit Photography by Daniel McVey.

Orion in the Canopy - Summit County, Colorado. Photo posted to EarthSky Facebook in March 2015 by Daniel McVey. Visit Photography by Daniel McVey.

The stars Alnilam, Mintaka and Alnitak form Orion%u2019s belt.<br />

The stars Alnilam, Mintaka and Alnitak form Orion%u2019s belt.<br />

This phenomenon only happens once every 2373 years and the last event was the December 3, 2012 one hour before sunrise. According to some thinkers the Giza Pyramids have been built according to the constellation of Orion, formed by the bright stars Alnitak, and Mintaka Alnilam. The largest of these pyramids was ordered built by the pharaoh of the Fourth Dynasty of Ancient Egypt Khufu and completed around 2570. C.

This phenomenon only happens once every 2373 years and the last event was the December 3, 2012 one hour before sunrise. According to some thinkers the Giza Pyramids have been built according to the constellation of Orion, formed by the bright stars Alnitak, and Mintaka Alnilam. The largest of these pyramids was ordered built by the pharaoh of the Fourth Dynasty of Ancient Egypt Khufu and completed around 2570. C.

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