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[4] [5] According to science fiction scholar Brian Stableford, writing in the 2006 work Science Fact and Science Fiction: An Encyclopedia, it was thus not until the concept of space travel became widespread in science fiction—hence making evacuation of the Earth a conceivable prospect—that such stories became popular. [38]
Science fiction bibliographers E. F. Bleiler and Richard Bleiler, in the 1998 reference work Science-Fiction: The Gernsback Years, list various imaginary constituents of the pre-modern "science-fiction Solar System". Among these are planets between Venus and Earth, planets on the inside of a hollow Earth, and a planet "behind the Earth". [16]
Type Escape velocity Mass Volume ()Lowest Highest Lowest Highest Lowest Highest Star: 617.7 km/s Sun [11]332,830 M Earth Sun [26] [27]695,000 km Sun [27]Major planet: 4.3 k m/s Mercury
Thus, the Sun occupies 0.00001% (1 part in 10 7) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly 1 millionth (10 −6) that of the Sun. Jupiter, the largest planet, is 5.2 AU from the Sun and has a radius of 71,000 km (0.00047 AU; 44,000 mi), whereas the most distant planet, Neptune, is 30 AU ...
The point where this occurs is known as the subsolar point. In Islamic astronomy, the passing of the Sun over the zenith of Mecca becomes the basis of the qibla observation by shadows twice a year on 27/28 May and 15/16 July. [6] [7]
Peru's Huascarán (at 6,384.4 m or 20,946 ft) contends closely with Chimborazo, though the former is a mere 10 m (33 ft) closer to the Earth's centre. The fastest point on Earth or, in other words, the point farthest from Earth's rotational axis is the summit of Cayambe [14] in Ecuador, which rotates around Earth's axis at a speed of 1,675.89 ...
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Nevertheless, there are also many fictional planets that differ significantly from Earth. [1] [2] [3] Earth-like planets have become less common in fiction following the first detection of an exoplanet around a Sun-like star in 1995, [a] reflecting the scarcity of such worlds among the thousands discovered since.