Kuinkahan lähellä Maan rataa voisivat naapuriplaneettamme teoriassa kiertää niin että radat vielä pysyisivät stabiileina. Nythän Maan ja Venuksen, samoin kuin Maan ja Marsin keskinäinen vetovoima on niin pieni että sen vaikutusta kiertoratoihin on tuskin pystytty mittaamaan, vai onko?

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"Despite the fact that many diagrams represent the solar system as having each orbit the same distance apart, in actuality the orbits are largely arranged geometrically, that is, each is roughly double the distance from the Sun as the one before it. Venus’s distance from the Sun is roughly double that of Mercury, Earth’s distance is roughly double that of Venus, Mars’s double that of Earth etc. This relationship is expressed in the Titius-Bode law, a mathematical formula for predicting the semi-major axes of planets in AU. In its simplest form, it is written:

a= 0.4 + 0.3\times k

where k=0, 1, 2, 4, 8, 16, 32, 64, 128.

By this formulation, one would expect Mercury's orbit (k=0) to be 0.4 AU, and Mars's orbit (k=4) to be at 1.6 AU. In fact their orbits are 0.38 and 1.52 AU.Ceres, the largest asteroid, lies at k=8.

This law is only a rough guide, and doesn't fit all of the planets; Neptune is far closer than predicted, though Pluto lies at Neptune's predicted orbit. As of now, there is no scientific explanation for why this law applies, and many claim it is merely a coincidence, falling into the region of uncomfortable science."

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