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LOOKING UP (What Do We See?). Information from the Cosmos. Ordinary matter (meteors, cosmic rays, lunar rocks) Neutrinos (Sudbury Neutrino Observatory!) http://www.sno.phy.queensu.ca/ Gravitational waves. But most important of all. L I G H T !

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Slide1 l.jpg

LOOKING UP

(What Do We See?)


Information from the cosmos l.jpg
Information from the Cosmos

  • Ordinary matter (meteors, cosmic rays, lunar rocks)

  • Neutrinos (Sudbury Neutrino Observatory!)

    • http://www.sno.phy.queensu.ca/

  • Gravitational waves


  • But most important of all l.jpg
    But most important of all

    LIGHT!

    Light ofall colours, that is, even those which

    are not visible to the human eye!


    Start with visible light l.jpg
    Start with Visible Light

    Imagine the Earth perpetually shrouded in clouds.

    Suddenly the clouds lift. What do you see?


    1 conspicuous objects l.jpg
    1. Conspicuous Objects

    • The Sun! - essentially invariable in appearance, except for eclipses and (rare) large sunspots

    • The Moon! – very different: constantly changing

    • The stars! – in immutable, apparently unchanging patterns (the constellations)






    Why the phases here we see earth and the moon from a spacecraft near mars l.jpg
    Why the Phases? (Here we see Earth and theMoon from a spacecraft near Mars.)


    Why the lunar phases l.jpg
    Why the Lunar Phases?

    NOT the shadow of the Earth!

    Merely changing perspectives.

    See simulations in class! And visit

    http://antwrp.gsfc.nasa.gov/apod/image/0709/lunation_ajc.gif



    Yet more l.jpg
    Yet More

    • We note that the individual stars are not identical. What does this tell you?

      [brainstorm time!]

    • There are star-like objects that wander about, in complex but ever-repeating ways –planets.



    Still more l.jpg
    Still More

    …the Milky Way



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