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WHAT WOULD HAPPEN TO THE EARTH IF THE MOON WERE HITS BY 30-MILE WIDE ASTEROID??

WHAT HAPPENS WHEN A NEEDLE HITS THE EARTH AT THE SPEED OF LIGHT??

how is an electron in an atom always spinning without losing any energy?

How do you find if a compound is an ionic or covalent by just looking at its chemical formula?

How long does it takes for carbon dioxide to leave the atmosphere?

If scientists say the universe will end in 5 billion years, but we can see galaxies 12 billion light years away, has the universe already ended?