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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!) Gravitational waves. But most important of all. L I G H T !

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(What Do We See?)

information from the cosmos
Information from the Cosmos
  • Ordinary matter (meteors, cosmic rays, lunar rocks)
  • Neutrinos (Sudbury Neutrino Observatory!)
  • Gravitational waves
but most important of all
But most important of all


Light ofall colours, that is, even those which

are not visible to the human eye!

start with visible light
Start with Visible Light

Imagine the Earth perpetually shrouded in clouds.

Suddenly the clouds lift. What do you see?

1 conspicuous objects
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 lunar phases
Why the Lunar Phases?

NOT the shadow of the Earth!

Merely changing perspectives.

See simulations in class! And visit

yet more
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
Still More

…the Milky Way