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"Atoms synthesized in the interiors of stars are commonly returned to the interstellar gas… The atoms returned are, naturally, those most readily made in the thermonuclear reactions in stellar interiors:…. All the elements of the Earth except hydrogen and some helium have been cooked by a kind of stellar alchemy billions of years ago in stars, some of which are today inconspicuous white dwarfs on the other side of the Milky Way Galaxy. The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff."

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Theme by: Miguel
  1. clearscience: We’ve been talking about spatial ways to think of numbers, i.e. as points on a line. We saw that addition (& subtraction) and multiplication (& division) can be thought of as manipulations of a line segment. Now, consider two numbers. Say we represent them on two lines, as shown above. Then we say that whatever the first number is, the second has to be twice that. So if the first is 1, the second is 2. Think of arrows pointing where the numbers are. Imagine grabbing the first number’s arrow and sliding it up to a higher value. The second number’s arrow will have to slide, too. If you slide the first number to 3, the second will go to 6. Because it has to be twice as much. Where ever you slide the arrow for the first number, the arrow for the second will shoot out even further, always being twice as much. This is math! 

    clearscience:

    We’ve been talking about spatial ways to think of numbers, i.e. as points on a line. We saw that addition (& subtraction) and multiplication (& division) can be thought of as manipulations of a line segment.

    Now, consider two numbers. Say we represent them on two lines, as shown above. Then we say that whatever the first number is, the second has to be twice that. So if the first is 1, the second is 2.

    Think of arrows pointing where the numbers are. Imagine grabbing the first number’s arrow and sliding it up to a higher value. The second number’s arrow will have to slide, too. If you slide the first number to 3, the second will go to 6. Because it has to be twice as much.

    Where ever you slide the arrow for the first number, the arrow for the second will shoot out even further, always being twice as much. This is math! 

    2. 9 Notes
    1. madeofstarstuff reblogged this from clearscience
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    Reblogged: clearscience