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Actually in those lines, the earth may even be considered the center of the universe. So Galileo was falsely accusing those Catholics of telling lies. The earth is the center of the universe, relative to an earthly observer. As simply as the sky tells it. Poor Catholics
Neither is true. Both the earth and the sun are orbiting around their common centre of gravity. The presence of all the other planets just makes it more complicated :-)
Quote from: Soul SurferNeither is true. Both the earth and the sun are orbiting around their common centre of gravity. The presence of all the other planets just makes it more complicated :-)I'm sure someone has figured out how far from the sun that common centre is. I wonder if it is outside the sun's surface.
Taking, according to wiki, Sun mass ≈ 2*1030 kg, Earth mass ≈ 3*1024 kg and Sun-Earth average distance ≈ 150 millions km, with a mental compute the centre of mass is 450 km from the Sun's centre. Sun's radius is ≈ 700.000 km, so...
LightarrowSomewhere the Earth has lost half its mass, one of those dreaded LHC blackholes ?
What is the mass of the Earth?Mass is the amount of matter in an object. The mass of the Earth is estimated to be 6 sextillion, 588 quintillion short tons (6.6 sextillion short tons) or 5.97 x 1024 kilograms. A short ton equals 2,000 pounds as opposed to a long ton, the unit used in Great Britain, which equals 2,240 pounds. The Earth has an average density of 5.52 grams per cubic centimeter, which is 5.52 times the average density of water (the standard).The method for calculating the mass of the Earth was adopted by the International Astronomical Union in 1964 and recognized by the International Union of Geodesy and Geophysics in 1967.Sources: Asimov, Isaac. Asimov's Guide to the Earth and Space, pp. 34-35; Emiliani, Cesare. The Scientific Companion, p. 167; Famighetti, Robert, ed. The World Almanac and Book of Facts 1995, p. 269.
Don't spank your computer.Spank your ram.
Soulsurfer"but the centre of gravity of the earth moon system is above the surface of the earth"I believe this is not correct.
No it is not in the case of the earth sun system only but the centre of gravity of the earth moon system is above the surface of the earth. The moon's orbit is also always concave with respect to the sun so the earth moon system could well be considered to be a double planet