1. Our Place in the Universe - PowerPoint PPT Presentation

Slide1 l.jpg
Download
1 / 35

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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

Download Presentation

1. Our Place in the Universe

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Slide1 l.jpg

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


Slide2 l.jpg

Lecture 1: Contents and Scales of the Universe


1 our place in the universe l.jpg

1. Our Place in the Universe


Asteroid l.jpg

Asteroid

A relatively small and rocky object which orbits a star.


Comet l.jpg

Comet

A relatively small and icy object which orbits a star.


Slide8 l.jpg

Moon

An object which orbits a planet.


Slide10 l.jpg

Planet

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


Slide11 l.jpg

Star

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


Solar star system l.jpg

Solar (Star) System

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


Slide17 l.jpg

Nebula

An interstellar cloud

of gas and/or dust


Galaxy l.jpg

Galaxy

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


Universe l.jpg

Universe

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


Slide22 l.jpg

Galaxy Cluster


Slide23 l.jpg

What does this mean?

1500 light years away!


Looking back in time l.jpg

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!


How large is the cosmos l.jpg

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?


Slide26 l.jpg

THE COSMIC

CALENDAR

(1 mo: 1.17 billion yrs)


A universe in motion l.jpg

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!


Slide28 l.jpg

The Earth orbits the Sun once every year.

The Earth’s axis is tilted by 23.5º!


Slide29 l.jpg

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!


The milky way moves with the expansion of the universe l.jpg

The Milky Way moves with the expansion of the Universe!

  • 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.


Slide31 l.jpg

How have

astronomical objects and events

affected life on Earth?

Here’s some ideas…


Slide35 l.jpg

Homework: Read page 1-17 in Universe


  • Login