General Geosciences and Astrophysics I
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General Geosciences and Astrophysics I -Astrophysics-. Marcus Brüggen. 1. Our Place in the Universe. TEXTBOOK: The Universe , Freedman & Kaufmann Freeman & Co. ISBN 0-7167-9884-0. Lecture 1: Contents and Scales of the Universe.

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General Geosciences and Astrophysics I


Marcus Brüggen

1. Our Place in the Universe

TEXTBOOK: The Universe, Freedman & Kaufmann

Freeman & Co.

ISBN 0-7167-9884-0

Asteroid l.jpg

A relatively small and rocky object which orbits a star.

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A relatively small and icy object which orbits a star.

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An object which orbits a planet.

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A moderately large object which orbits a star; it shines by reflected light. Planets may be rocky, icy, or gaseous in composition.

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A large, glowing ball of gas that generates heat and light through nuclear fusion

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Solar (Star) System

A star and all the material which orbits it, including its planets and moons

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An interstellar cloud

of gas and/or dust

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A great island of stars in space, all held together by gravity and orbiting a common center

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The total sum of all matter and energy; that is, everything within and between all galaxies

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What does this mean?

1500 light years away!

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Looking back in time

  • Light, although fast, travels at a finite speed.

  • It takes:

    • 8 minutes to reach us from the Sun

    • 8 years to reach us from Sirius (8 light-years away)

    • 1,500 years to reach us from the Orion Nebula

  • The farther out we look into the Universe, the farther back in time we see!

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How large is the Cosmos?

  • Let’s view it to scale

    • say the Sun is the size of a large grapefruit (13.9 cm)

Where is the nearest star?

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(1 mo: 1.17 billion yrs)

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A Universe in motion

  • Contrary to our perception, we are not “sitting still.”

  • We are moving with the Earth.

    • and not just in one direction

The Earth rotates around it’s axis once every day!

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The Earth orbits the Sun once every year.

The Earth’s axis is tilted by 23.5º!

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Our Sun moves relative to the other stars in the local Solar neighborhood!

Our Sun and the stars of the local Solar neighborhood orbit around the center of the Milky Way Galaxy every 230 million years!

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The Milky Way moves with the expansion of the Universe! neighborhood!

  • Mostly all galaxies appear to be moving away from us.

  • The farther away they are, the faster they are moving.

    • Just like raisins in a raisin cake; they all move apart from each other as the dough (space itself) expands.

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How have neighborhood!

astronomical objects and events

affected life on Earth?

Here’s some ideas…