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How do we Know the Earth is 4.6 Billion Years Old?

How do we Know the Earth is 4.6 Billion Years Old?

Currently, scientists are quite confident in dating planet Earth at 4.6 billion years old. However, that is not to say we have not seen our share of shocking revelations on otherwise “bullet-proof” theories in past centuries (*cough* Earth-centered universe. (*cough, cough* expanding universe!). But, how do we know the Earth is 4.6 billion years old? Over past centuries, human beings have thrown several guesses at Earth’s age. In fact, many ancient cultures simply assumed the Earth began when we did…

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How Do We Know Black Holes Exist?

How Do We Know Black Holes Exist?

  Black holes are objects in space with gravity and density so strong, even light is unable to escape their grasp! Hence, the fitting name, black hole. Naturally, you might be asking yourself, “how do we know black holes exist?” After all, how do you “see” something that emits no light? Without any visible light, our human eyes cannot see black holes. However, we can zero in on a black hole by watching how their powerful gravity affects things ––…

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