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The Traveling Exhibit. Alien Earths. Science Background Part A: INTRO & Our Place in Space. prepared by Dr. Cherilynn Morrow for the Space Science Institute Boulder, CO. The Questions Behind the Exhibit. Are we alone?. Where do stars and planets come from?.

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slide1

TheTraveling Exhibit

Alien Earths

Science Background

Part A: INTRO & Our Place in Space

prepared by Dr. Cherilynn Morrow for the Space Science Institute Boulder, CO

the questions behind the exhibit
The Questions Behind the Exhibit

Are we alone?

Where do stars and planets come from?

What would life elsewhere be like?

the big ideas
The Big Ideas

We are developing extraordinary new tools, techniques, and insights for exploring the age-old question of whether there is life beyond Earth.

Our search for habitable worlds and signs of life in our galaxy is guided by our study of how stars and planets form & our understanding of life on Earth.

welcome to the exhibit
Welcome to theExhibit

Alien Earths

  • Our Place in Space (Powers of 10 display) straight back
  • Search for Life to the left
  • Star & Planet Formation to the right
  • Planet Quest Dome straight back

The science background is organized by EXHIBIT AREA:

a our place in space
A. Our Place in Space

KEY QUESTIONS:

What and where are we in the cosmos?

Could there be other planets like Earth out there?

slide6

3. Stars and star systems orbit the centers of galaxies

  • Moons
  • orbit planets

4. Galaxies orbit each

other in clusters.

2. Planets orbit stars

slide7

Pre-Visit Activity

Alien Earths

Can You Fill in the Blanks?

Click for Answers

Exploring the Structure of the Universe

Before entering the exhibit, fill in the blanks using the following key words.

galaxy orbit solar system moon star Universe Earth Jupiter planets Sun

100 billion

The Sun is a _________ located at the center of our __________________. Our home, called __________, is one of 9 planets that orbit around the _________. Earth has one _________ that orbits around it each month, showing different phases. Some planets have many moons that ___________ around them. ________________ is the largest planet in the Solar System and has 64 moons! Our sun is one of about _______________ stars contained in the spiral _____________ we call the Milky Way. Astronomers are now discovering Jupiter-sized ____________ that orbit around some of those distant stars. Outer space is even bigger yet because the Milky Way is only one of an estimated 100 billion (100,000,000,000) galaxies in the ______________!

star

solar system

Earth

Sun

moon

orbit

Jupiter

100 billion

galaxy

planets

Universe

Astronomy Games: Fill-in-the-Blank Copyright 2000 Cherilynn Morrow – Used with permission [email protected]

earth is one of 9 planets in our solar system the planets orbit a central star we call the sun

Our Place in the Solar System

Earth is one of 9 PLANETS* in our SOLAR SYSTEM. The planets orbit a central STAR we call the SUN.

Jupiter

Saturn

Mercury

Mars

Venus

Earth

Neptune

Uranus

Can you name the other planets?

Hit <RETURN> for answers

Rocky terrestrial planets of the inner solar system.

Gas & ice giant planets of the outer solar system.

Influenced by the gravity of Jupiter & Neptune, icy comets from the outer solar system likely delivered important ingredients for life to the young Earth environment (e.g. water and carbon compounds).

*The exact number depends on whether we call objects like Pluto “planets”.

slide9

Jupiter is the largest planet in our solar system.

  • Jupiter is a gaseous world without a solid surface.
  • Jupiter has twice the mass of all the other planets combined.
  • Jupiter is 10 times the diameter of Earth.
  • A thousand Earths would fit inside Jupiter.
slide10

Artist’s concept of 3 “extra-solar planets”

In the past decade, we have begun to detect the presence of Jupiter-sized worlds in orbit around other stars in our Milky Way galaxy.

slide11

The Goldilocks Effect

Venus

“Too Hot”

Earth

“Just Right!”

Mars

“Too Cold”

Earth is in our solar system’s “habitable zone” where liquid water can exist on the surface.

slide12

Earth-sun distance

not to scale

  • A hundred Earths would fit across the diameter of the Sun.
  • A million Earths would fit inside the volume of the Sun.
slide13

The Sun is the ONLY star in the SOLAR SYSTEM.

Earth is the ONLY planet in our solar system where we know for sure that life has evolved.

slide14

Our Place in the Galaxy

  • The Sun is the only star in the SOLAR SYSTEM, but it is one of over 100 billion stars in the GALAXY we call the Milky Way.
  • Our solar system is located about 2/3 of the way out from the galaxy’s center.
  • Astronomers think that most of the stars in the Milky Way galaxy could also have planets orbiting around them. These are called “extra-solar planets”.

Artist’s Concept of our Milky Way Galaxy

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The term “Milky Way” is used in two ways.

For purposes of this presentation, we mean the whole galaxy.

2. “Milky Way” = the band of light and dust that stretches across a dark night sky.* This is just a portion of one of the spiral arms that we can see from Earth.

1. “Milky Way” = our entire galaxy of 100 billion stars.* Our whole solar system orbits once around the galaxy’s center every 225 million years or so.

* The image above is of another spiral galaxy that may be a lot like our own Milky Way. It would not be possible to make such an image of our own galaxy from within it. This galaxy is called NGC 4414.

* The image above is a long exposure photograph, showing much more contrast than we would see with our naked eye. To the eye, the “Milky Way” looks like a faint, whitish band with a few dark patches.

slide16

There’d be about a 100 billion crystals. That’s how many stars in the whole Milky Way galaxy!

What if we filled this whole room with crystals of salt?

“Milky Stars”

Mirrored Room:

part of the

Alien Earths

exhibit

“What if we filled this whole room with crystals of salt?”

That’s how many stars in the whole Milky Way galaxy! ~ 100 billion!

slide17

Assume the Sun is the size of a large grapefruit:

  • Q1. About how big would planet Earth be on this scale? [Show size with your hands or an object. <RETURN> for answer.]
  • A1: About the size of a pencil tip
  • Of course, the Sun is really 10 billion times bigger than a grapefruit with a 14 cm diameter.
  • Q2: On this scale, how far away would pencil-tip “Earth” be from the grapefruit “Sun”?
  • A2: About 15 meters (50 ft) away. Pluto would be about ½ mile away.
  • Q3: On this scale, how far away would the nearest star in the Milky Way galaxy be?
  • A3: About 5000 km (3000 miles).
  • The East-West distance across the US!
slide18

So in this scale model, the space between the Sun and the NEAREST STAR in the Milky Way galaxy is like having one grapefruit on the Golden Gate bridge in San Francisco, and another grapefruit on the Brooklyn Bridge in New York.

Images of spiral galaxies make it seem like stars are crammed closely together, but in reality there are vast distances between them.

so many stars so little time
So Many Stars, So Little Time

At the present time, our technologies enable us to search around the nearest stars in the Milky Way galaxy (the pink sphere)for extra-solar planets or signs of intelligent life.

slide20

We are searching in a tiny portion of the Milky Way galaxy, and yet our galaxy is only one of more than 100 billion galaxies in the Universe!

All but 4 specks in this “Hubble Deep Field” image are

entire galaxies, each of them with 100 billion stars.

slide21

A. Our Place in Space

Earth is one of 9 PLANETS that orbit a STAR we call the SUN [“3rd rock from the Sun”]The Sun is at the center of the SOLAR SYSTEM and is the ONLY star in the Solar System.Our SUN is one of over 100 billion STARS in the GALAXY we call the Milky WayWe are detecting the presence of Jupiter-sized worlds in orbit around other stars in our Milky Way Galaxy.Our GALAXY is one of over 100 billion galaxies in the UNIVERSE!

SUMMARY

slide22

Test yourself on

“Earth’s Place in Space”

by taking a few minutes to play

TWO ASTRONOMY GAMES

OR

Skip ahead to

PART B: Star & Planet Formation

two astronomy games
Two Astronomy Games

"Small and LARGE"

"Near and Far"

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

slide24

On a sheet of paper, make two columns like the ones below:

Smallest

Closest

Farthest

Largest

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

slide25

Game # 1:

"Small and LARGE"

  • The next slide will show 9 images
  • Order the objects in these images from the smallest object (number 1) to largest object (number 9). Use the first column in the table you created.
  • Write the letter as well as the name of the object in the column. This way, you will have a list that you can consult later.

Are you ready?

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

slide26

A. THE SUN

B. EARTH

C. SPACE SHUTTLE

D. THE MOON

E. THE SOLAR SYSTEM

F. BEARS

G. MARS

H. A GALAXY

I. JUPITER

Press ENTER for a HINT

Mars has no oceans and the same

LAND area as Earth

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

the solution
The Solution

"small and LARGE"

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

slide28

1F. BEARS

2C. SPACE SHUTTLE

3D. THE MOON

4G. MARS

5B. EARTH

6I. JUPITER

8E. THE SOLAR SYSTEM

9H. A GALAXY

7A. THE SUN

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

slide29

Game # 2:

"Near and Far"

  • The next slide will show 9 images.
  • Order the objects in these images from the object that is nearest to the surface of Earth (number 1) to the object that is farthest from the surface of Earth (number 9). Use the second column in the table you created.
  • It would be best to write the letter as well as the name of the object in the column. This way, you will have a list that you can consult later.

Are you ready?

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

slide30

B. A GALAXY

A. THE SUN

C. AURORAS

Press ENTER for HINTS

If we see a whole spiral,

it can’t be our own galaxy.

Auroras occur in Earth’s

uppermost atmosphere

D. THE MOON

E. JET AIRPLANE

F. HUBBLE TELESCOPE

The Space Shuttle can visit

Hubble, but not the Moon

G. AN EAGLE

I. SATURN

H. STARS OF THE BIG DIPPER

Stars we see are within

the Milky Way galaxy

Saturn is 10 times farther

from the Sun than Earth

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

the solution31
The Solution

“Near and Far”

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

slide32

G. AN EAGLE

C. AURORAS

E. JET AIRPLANE

D. THE MOON

A. THE SUN

F. HUBBLE TELESCOPE

H. STARS OF THE BIG DIPPER

I. SATURN

B. A GALAXY

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

slide33

"Small and LARGE"

"Near and Far"

  • These games are available on-line in multiple modalities:
        • As you see it here in PowerPoint
        • As a downloadable card game for the exhibit floor
        • As an on-line interactive
        • As a classroom activity
  • Go to www.alienearths.org.
  • Click on “Traveling Exhibition” then “Education Program” then “Activities”

Two Astronomy Games Copyright 2004 Cherilynn Morrow – Used with permission [email protected]

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