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“The body (of the alien pilot) was highly tolerant to changes in temperature, atmospheric conditions, and pressure. The limbs were quite frail, without musculature. In space there is no gravity, (Footnote) so very little muscle strength is needed. The body was used almost entirely on space craft or in low, or no-gravity environments. Since Earth has a heavy gravity, the body was not able to walk around very well as the legs were not really suited to that purpose. The feet and hands were quite flexible and agile however.”
— Excerpted from the book, Alien Interview, edited by Lawrence R. Spencer
“…in space there is no gravity…”
“The terms gravitation and gravity are mostly interchangeable in everyday use, but in scientific usage a distinction may be made. “Gravitation” is a general term describing the attractive influence that all objects with mass exert on each other, while “gravity” specifically refers to a force that is supposed in some theories (such as Newton’s) to be the cause of this attraction. By contrast, in general relativity gravitation is due to space-time curvatures that cause inertially moving objects to accelerate towards each other.
Isaac Newton’s theory of universal gravitation is a physical law describing the gravitational attraction between bodies with mass. It is a part of classical mechanics and was first formulated in Newton’s work Philosophiae Naturalis Principia Mathematica, published in 1687. In modern language it states the following:
Every point mass attracts every other point mass by a force pointing along the line intersecting both points. The force is proportional to the product of the two masses and inversely proportional to the square of the distance between the point masses:
where:
· F is the magnitude of the gravitational force between the two point masses,
· G is the gravitational constant,
· m1 is the mass of the first point mass,
· m2 is the mass of the second point mass,
· r is the distance between the two point masses.”
— Reference: Wikipedia.org