History of Solar System formation and evolution hypotheses the asteroids. Terrestrial planets would have no major moons which does not account for Luna. It predicts certain observations such as the similar angular velocity of Mars and Earth with similar rotation periods and axial tilts. In this scheme there are 6 principal planets: 2 terrestrial, Venus and Earth, 2 major, Jupiter and Saturn, and 2 outer, Uranus and Neptune; and 3 lesser planets: Mercury, Mars, and Pluto. This theory has a number of problems, such as explaining the fact that the planets all orbit the Sun in the same direction, which would appear highly unlikely if they were each
Stranger from Venus field. This disruption would then affect the orbits and gravitational fields of all the other planets in the solar system. The stranger makes a promise that if Earth eliminates these dangers, Venus will share some of its higher scientific knowledge with our scientists. During the meeting, however, the man from Venus concludes that humanity is not yet ready to receive such advanced knowledge. After his communication disc is stolen, which allows him to contact the approaching Venusian ship, the stranger quickly realizes that an interplanetary meeting of minds can never take place. He also learns that such a meeting will