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Many scientists, including [[Edouard Roche|&Eacute;douard Roche]], supported the hypothesis that the Earth and the Moon formed side by side from the material that formed all planets of this solar system. The name comes from the term "accretion disc", which is a disc formed by diffuse material that orbits a central body.<ref name="Nova1"/>

Many scientists, including [[Edouard Roche|&Eacute;douard Roche]], supported the hypothesis that the Earth and the Moon formed side by side from the material that formed all planets of this solar system. The name comes from the term "accretion disc", which is a disc formed by diffuse material that orbits a central body.<ref name="Nova1"/>

==Observations and caclulations==

==Observations and calculations==

For a long time, these three models had been accepted as possible lunar origins. However, later research gave a number of points that spoke against them.

For a long time, these three models had been accepted as possible lunar origins. However, later research gave a number of points that spoke against them.

After the Apollo program, rock samples taken from the Moon revealed two important things:

After the Apollo program, rock samples taken from the Moon revealed two important things: