Relativity, black holes and quantum mechanics

  • The ultra particle
    problem

    The ultra particle

    Age
    16 to 18
    Challenge level
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    Explore the energy of this incredibly energetic particle which struck Earth on October 15th 1991
  • Escape from planet Earth
    problem

    Escape from planet earth

    Age
    16 to 18
    Challenge level
    filled star filled star empty star
    How fast would you have to throw a ball upwards so that it would never land?
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