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TM Well done on getting your Factivity Explorer ID card! TM Galactic Explorer Name: Paste your photo here Age: Fill in your name and get a grown-up to help you cut out your ID card and paste your photo onto it. SPACE Answers 1) False – The sun is not a planet, it is a star. 2) Venus is the hottest planet in our solar system 3) Mars’s volcano Olympus Mons is 2.5 times higher than Earth’s Mount Everest 4) Neptune is the coldest planet in our solar system