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The troposphere is the lowest layer of Earth's atmosphere. It extends from Earth's surface to an average height of about 12 km (7.5 mi; 39,000 ft), although this altitude varies from about 9 km (5.6 mi; 30,000 ft) at the geographic poles to 17 km (11 mi; 56,000 ft) at the Equator, [17] with some variation due
1:18 scale is a traditional scale (ratio) for models and miniatures, in which 18 units (such as inches or centimeters) on the original is represented by one unit on the model. Depending on application, the scale is also called two third inch scale since 1 foot is represented by 2/3 of an inch.
The station orbits the Earth at an average altitude of 400 kilometres (250 miles) [12] and circles the Earth in roughly 93 minutes, completing 15.5 orbits per day. [ 13 ] The ISS programme combines two previously planned crewed Earth-orbiting stations: the United States' Space Station Freedom and the Soviet Union's Mir-2 .
The horizontal, or altitude-azimuth, system is based on the position of the observer on Earth, which revolves around its own axis once per sidereal day (23 hours, 56 minutes and 4.091 seconds) in relation to the star background. The positioning of a celestial object by the horizontal system varies with time, but is a useful coordinate system ...
By definition, at Mach 1, the local flow velocity u is equal to the speed of sound. At Mach 0.65, u is 65% of the speed of sound (subsonic), and, at Mach 1.35, u is 35% faster than the speed of sound (supersonic). An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound.
On 26 April 2024, the soundtrack for the 1.21 "Tricky Trials" Update of Minecraft was released on digital streaming platforms. [49] The album combines music from Cherof, Tanioka and Raine for the first time. [50]
The planet has 6.9 Earth masses and 1.8–2.4 Earth radii, and with its close orbit receives 40 percent more stellar radiation than Earth, leading to surface temperatures of about 60° C. [ 147 ] [ 148 ] [ 149 ] HD 40307 g , a candidate planet tentatively discovered in November 2012, is in the circumstellar habitable zone of HD 40307 . [ 150 ]
New Earth is a composite of the Pre-Crisis Earth-One, the Pre-Crisis Earth-Two, the Pre-Crisis Earth-Four, the Pre-Crisis Earth-X, the Pre-Crisis Earth-S and the Dakotaverse Merged with Vertigo Earth and Earth-50 in the wake of the Flashpoint event and had its history rewritten as a result, creating The New 52 [ 41 ]