The Reasons For The Seasons! Moon Phase Earth View. Instructions The application is divided into three parts.
Big Bang & Birth of the Earth. Where did the Moon come from? StarChild Question of the Month for October 2001 Question: Where did the Moon come from?
Answer: Any theory which explains the existence of the Moon must naturally explain the following facts: The Moon's low density (3.3 g/cc) shows that it does not have a substantial iron core like the Earth does. Various theories had been proposed for the formation of the Moon. The Fission Theory: This theory proposes that the Moon was once part of the Earth and somehow separated from the Earth early in the history of the solar system. There is one theory which remains to be discussed, and it is widely accepted today.
The Giant Impactor Theory (sometimes called The Ejected Ring Theory): This theory proposes that a planetesimal (or small planet) the size of Mars struck the Earth just after the formation of the solar system, ejecting large volumes of heated material from the outer layers of both objects. More About The Giant Impactor Theory Image Credit: Joe Tucciarone. Seasons Interactive. Reasons for the Seasons. By Jon Kahl (figures from Jack William's The USA Today Weather Book) Are the seasons caused by the distance between the sun and the earth?
Is winter colder because during that season the earth is farther away from the sun? The amount of sunlight the earth receives is called insolation: incoming solar radiation Two factors cause insolation to change. Why are summer days longer and winter days shorter? As the earth revolves around the sun, its axis (a line connecting the North and South poles) is tilted slightly. Phases Interactive.