Wikipedia:Main Page history/2019 July 24
From today's featured articleThe Office of the Inspector General of the United States Army is the agency tasked with investigating the army. Its stated mission includes "advice and oversight to the army through ... inspection, assistance, investigations, and training". George Washington and members of the Continental Congress requested an inspector general for the Continental Army in 1777, and Thomas Conway was appointed the same year. His successor was Friedrich Wilhelm von Steuben, a Prussian military officer who later served as Washington's chief of staff. The office has been reorganized many times, and has varied in size dramatically. In its early days, the inspectorate was frequently merged with, or proposed to be part of, the Adjutant General's department. It expanded greatly after the Civil War, and had grown to around 2,000 officers by 1993. Leslie C. Smith (pictured) has been the inspector general since February 2018. (Full article...)
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On this dayJuly 24: Pioneer Day in Utah (1847)
Princess Charlotte of Prussia (b. 1860) · John William Finn (b. 1909) · Jennifer Lopez (b. 1969) |
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The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of plasma, heated by nuclear fusion of hydrogen into helium in its core, with internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometres (860,000 miles) or 109 times that of Earth, while its mass is about 330,000 times that of Earth. It accounts for about 99.86% of the total mass of the Solar System. Roughly three-quarters of the Sun's mass consists of hydrogen; the rest is mostly helium, with much smaller quantities of heavier elements, including oxygen, carbon, neon and iron. This false-color photograph of the Sun was taken by the Atmospheric Imaging Assembly instrument on NASA's Solar Dynamics Observatory (SDO) at a wavelength of 304 angstroms, in the extreme ultraviolet region of the electromagnetic spectrum.
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