Why is it dark at night?

Anyone who has ever ventured into science education knows that the questions kids ask are by far the hardest. As adults, we simply accept certain “truths” without questioning them, but kids don’t. They want to know why the sky is blue — a question most adults cannot answer.

Another question most of us can’t answer is: Why is it dark at night?

If you can’t explain that one, spend four minutes here and you’ll be set.


About Fletcher DeLancey

Socialist heathen and Mac-using author of the Chronicles of Alsea, who enjoys pondering science, politics, well-honed satire (though sarcastic humor can work, too) and all things geeky.
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9 Responses to Why is it dark at night?

  1. Carys says:

    That reminded me of why I fell in love with physics in the first place. Not enough to make me go back to it you understand, but still, loved it. Thank you 🙂

  2. Inge says:

    Damn… i always thought we saw a ‘black’ sky at night because you can only see light when it interacts with something so it gets reflected.. Obviously wrong.. 😦

  3. Cathy White says:

    I enjoyed that, but didn’t understand a word of it lol. I was too busy watching the pictures take shape.

  4. Cathy White says:

    Ok, I watched it again, this time it still made no sense, but now I have the vision of Sheldon’s Doppler effect costume in my head lol. Lisa and I might have to stick together on this one :-)Oh we’ll, I’m off to pick daffodils, make a few £ selling them at the tea room for Mothers Day!

  5. xenatuba says:

    That was just plain cool. The concepts, the easy explanations, and the awesome drawings.

  6. Paulo says:

    One may know what the cosmic background radiation is, what redshift means, have an idea about how light behaves and the space-time continuum, know that the expansion of the Universe is accelerating, etc…. but it’s not until a simple question like “Why is it dark at night” is asked and answered that it all comes together in a beautiful way.

    Thanks, that was extremely cool.

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