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The life-cycle of the Solar System
The formation of the Sun and the planets started with the contraction of a dust cloud about 4.5 billion years ago.
Grades 5 – 12
موزالينک
/لينک وب
The formation of the Sun and the planets started with the contraction of a dust cloud about 4.5 billion years ago.
Grades 5 – 12
موزالينک
/لينک وب