1) were is solar system in milky wave galaxy a) in Galactic Center b) inner edge of the Orion Arm 2) how many galaxies in the universe a) between 204 billion (2×1811) to 52 trillion b) between 200 billion (2×1011) to 2 trillion 3) The concept of gravity was discovered by which famous physicist a) Albert Einstein b) Isaac Newton 4) Which is the most abundant element in the universe? a) helium b) Hydrogen 5) What is the hardest natural substance on Earth? a) bedrock b) Diamond

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