Why are the orbits of planets elliptacal rather than circular? (For GCSE level students.) - asked by: jill ensell
Why does the tilt of the Earth's axis relative to its orbit cause the seasons as the Earth revolves around the sun? - asked by: James Agius
When did scientists discover plasma? - asked by: Sayan
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'Wisdom is the daughter of Experience, Truth is only the daughter of Time.'Leonardo da Vinci(1452-1519)