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    Stars twinkle when we see them from the Earth's surface because we are viewing them through thick layers of turbulent (moving) air in the Earth's atmosphere. Stars (except for the Sun) appear as tiny dots in the sky; as their light travels through the many layers of the Earth's atmosphere, the light of the star is bent (refracted) many times and in random directions (light is bent when it hits a change in density - like a pocket of cold air or hot air). This random refraction results in the star winking out (it looks as though the star moves a bit, and our eye interprets this as twinkling). Stars closer to the horizon appear to twinkle more than stars that are overhead - this is because the light of stars near the horizon has to travel through more air than the light of stars overhead and so is subject to more refraction. Also, planets do not usually twinkle, because they are so close to us; they appear big enough that the twinkling is not noticeable (except when the air is extremely turbulent). Stars would not appear to twinkle if we viewed them from outer space (or from a planet/moon that didn't have an atmosphere). from enchantedlearning... #Stars #Astronomy #Stellar_Scintillation

    Activity: awesome idea for teaching "distance" concepts in space - LOVE it - children of all ages!

    earth layers in a jar

    Earth Day Emergent Reader :)

    A view of Earth from the Moon taken by NASA.

    FREE! A fun way to find out more about classmates for Earth Day.

    Layers of Earth's Atmosphere diorama

    Sun, Earth, Moon Comparison Activity by Science Doodles

    wk 15 This is pretty interesting... Views from the top of the 7 highest mountains. CC Cycle 1, Week, 15

    layers of the earth

    50 Amazing Facts About Earth

    Five Layers of the Earth Atmosphere Interactive Notebook Page www.teacherspayte...

    To celebrate Earth Day this unit contains activities correlated to Lynne Cherry's The Great Kapok tree. It also contains activities beyond the boo...

    The Homeschool Den: Earth Science: Layers of the Earth Hands-on Activity

    How tiny we are

    George A. Van Biesbroeck (1880-1974), astronomer at Yerkes Observatory observing Mars when it approached close to the earth in 1926, and using the 40 inch refracting telescope, the largest of its kind in the world

    flip book for layers of the earth

    Play theme cheat sheet: Outer Space - part of an awesome series of monthly activity round ups centered on a theme.

    Interactive tool. How does the relative size of today compare to a year, a century, a millennium, and epoch, and the amount of time humans have been on the earth? Click the word Okay at the bottom and watch the timeline unfold.

    Template for constructing a working spinner model showing the layers of the Earth. Each quarter turn of the wheel reveals a new layer. 7" size makes it perfect for interactive notebooks. It comes with both b/w and color templates and blank labels so you can choose what info to require. $

    Your Weight in Outer Space. On Earth, On Jupiter, On Mars, On Moon.