SlideShare a Scribd company logo
Why Am I Here?Why Am I Here?
To tell you about what’s out there in theTo tell you about what’s out there in the
Universe.Universe.
I’m anI’m an astronomerastronomer, which is a kind of, which is a kind of
scientist.scientist.
I get to study stars and galaxies, and theyI get to study stars and galaxies, and they
pay me to do it!pay me to do it!
What do we call the star that isWhat do we call the star that is
the nearest star to Earth… by far?the nearest star to Earth… by far?
The Sun!The Sun!
WhatWhat IsIs AA StarStar ??
Stars look bright and tiny to us, but theyStars look bright and tiny to us, but they
areare huge dense balls of gashuge dense balls of gas lit up fromlit up from
the inside by their own internal nuclearthe inside by their own internal nuclear
power.power.
All stars were born from gas and dust thatAll stars were born from gas and dust that
collapsed into a fiery ball because ofcollapsed into a fiery ball because of
gravity.gravity.
Stars have different masses. TheStars have different masses. The
heaviest are 100 times bigger than theheaviest are 100 times bigger than the
lightest ones.lightest ones.
The Sun is One of Many,The Sun is One of Many,
Many Stars in Our GalaxyMany Stars in Our Galaxy
What’s A Galaxy?What’s A Galaxy?
A galaxy is a huge collection of stars,A galaxy is a huge collection of stars,
held together in space by gravity.held together in space by gravity.
Stars are very far apart and do notStars are very far apart and do not
bump into each other.bump into each other.
 Galaxies also have clouds of gasGalaxies also have clouds of gas
and dust between the stars.and dust between the stars.
Those clouds may make new starsThose clouds may make new stars
one day, and recycle the dying ones.one day, and recycle the dying ones.
What do we call the galaxy weWhat do we call the galaxy we
live in?live in?
The Milky Way isThe Milky Way is OurOur GalaxyGalaxy
Why is it called “Why is it called “MilkyMilky”?”?
What the Milky Way Looks Like
from the Inside
Where is the Sun inside theWhere is the Sun inside the
Milky Way?Milky Way?
TOP VIEW
SIDE VIEW
The Milky Way isThe Milky Way is OurOur GalaxyGalaxy
Our galaxy contains about 200 billionOur galaxy contains about 200 billion
stars – 200,000,000,000stars – 200,000,000,000
But the total mass of the galaxy is 5But the total mass of the galaxy is 5
times more than that.times more than that.
Loose-floating gas & dust onlyLoose-floating gas & dust only
account for “only” about another 200account for “only” about another 200
billion stars’ worth.billion stars’ worth.
The galaxy is about the same age asThe galaxy is about the same age as
the universe: 13 billion years old.the universe: 13 billion years old.
The Andromeda Galaxy is similar to ours.
GalaxiescomeInmanyshapesandsizes.
Elliptical
Spiral
Barred
Spiral
The Hubble Ultra Deep Field

More Related Content

What's hot

Grade 4 - weather power point
Grade 4  - weather power pointGrade 4  - weather power point
Grade 4 - weather power point
andreamcferran
 
Grade 7 SCIENCE
Grade 7 SCIENCEGrade 7 SCIENCE
Grade 7 SCIENCE
Joel Linquico
 
Volcanoes and Other Igneous Activity
Volcanoes and Other Igneous ActivityVolcanoes and Other Igneous Activity
Volcanoes and Other Igneous Activity
Jundel Deliman
 
Gravity for Elementary and Middle students (Teach)
Gravity for Elementary and Middle students (Teach)Gravity for Elementary and Middle students (Teach)
Gravity for Elementary and Middle students (Teach)
Moira Whitehouse
 
Minerals and rocks
Minerals and rocksMinerals and rocks
Minerals and rocks
Noura Ishnawer
 
The greenhouse effect
The greenhouse effectThe greenhouse effect
The greenhouse effect
Rachel Espino
 
Wind
WindWind
Class 6 Science : Different kinds of materials
Class 6 Science : Different kinds of materialsClass 6 Science : Different kinds of materials
Class 6 Science : Different kinds of materials
LearnRoots
 
transparent, translucent, and opaque
transparent, translucent, and opaquetransparent, translucent, and opaque
transparent, translucent, and opaque
AmySheppard15
 
Minerals And Rocks
Minerals And RocksMinerals And Rocks
Minerals And Rocks
cmcelraft
 
The moon..history, features, and effects. (teach)
The moon..history, features, and effects. (teach)The moon..history, features, and effects. (teach)
The moon..history, features, and effects. (teach)
Moira Whitehouse
 
gas solid and liquid grade 5
gas solid and liquid grade 5 gas solid and liquid grade 5
gas solid and liquid grade 5
Raizen Jhay Garcia
 
Types of rock gr. 6
Types of rock gr. 6Types of rock gr. 6
Types of rock gr. 6
Ruba Salah
 
Stars and Planets presentation for grade 4
Stars and Planets presentation for grade 4Stars and Planets presentation for grade 4
Stars and Planets presentation for grade 4
EmanMahmoud79
 
magnetic force.pptx
magnetic force.pptxmagnetic force.pptx
magnetic force.pptx
cindydizon6
 
lessons in Weathering of Grade five.pptx
lessons in Weathering of Grade five.pptxlessons in Weathering of Grade five.pptx
lessons in Weathering of Grade five.pptx
NeilDeclaro1
 
Sound energy
Sound energySound energy
Sound energy
YhanzieCapilitan
 

What's hot (20)

Grade 4 - weather power point
Grade 4  - weather power pointGrade 4  - weather power point
Grade 4 - weather power point
 
Grade 7 SCIENCE
Grade 7 SCIENCEGrade 7 SCIENCE
Grade 7 SCIENCE
 
Philippine Typhoons
Philippine TyphoonsPhilippine Typhoons
Philippine Typhoons
 
Volcanoes and Other Igneous Activity
Volcanoes and Other Igneous ActivityVolcanoes and Other Igneous Activity
Volcanoes and Other Igneous Activity
 
Gravity for Elementary and Middle students (Teach)
Gravity for Elementary and Middle students (Teach)Gravity for Elementary and Middle students (Teach)
Gravity for Elementary and Middle students (Teach)
 
Minerals and rocks
Minerals and rocksMinerals and rocks
Minerals and rocks
 
The greenhouse effect
The greenhouse effectThe greenhouse effect
The greenhouse effect
 
Wind
WindWind
Wind
 
Class 6 Science : Different kinds of materials
Class 6 Science : Different kinds of materialsClass 6 Science : Different kinds of materials
Class 6 Science : Different kinds of materials
 
Magnets
MagnetsMagnets
Magnets
 
transparent, translucent, and opaque
transparent, translucent, and opaquetransparent, translucent, and opaque
transparent, translucent, and opaque
 
Minerals And Rocks
Minerals And RocksMinerals And Rocks
Minerals And Rocks
 
The moon..history, features, and effects. (teach)
The moon..history, features, and effects. (teach)The moon..history, features, and effects. (teach)
The moon..history, features, and effects. (teach)
 
gas solid and liquid grade 5
gas solid and liquid grade 5 gas solid and liquid grade 5
gas solid and liquid grade 5
 
Types of rock gr. 6
Types of rock gr. 6Types of rock gr. 6
Types of rock gr. 6
 
Stars and Planets presentation for grade 4
Stars and Planets presentation for grade 4Stars and Planets presentation for grade 4
Stars and Planets presentation for grade 4
 
Meteors And Meteorites
Meteors And MeteoritesMeteors And Meteorites
Meteors And Meteorites
 
magnetic force.pptx
magnetic force.pptxmagnetic force.pptx
magnetic force.pptx
 
lessons in Weathering of Grade five.pptx
lessons in Weathering of Grade five.pptxlessons in Weathering of Grade five.pptx
lessons in Weathering of Grade five.pptx
 
Sound energy
Sound energySound energy
Sound energy
 

Viewers also liked

Arau citroen -article 1
Arau   citroen -article 1Arau   citroen -article 1
Arau citroen -article 1
Marie De Schrijver Pro
 
Galaxy Unit 2 (Grade 6)
Galaxy Unit 2 (Grade 6)Galaxy Unit 2 (Grade 6)
Galaxy Unit 2 (Grade 6)NatalieCocco
 
Stars and Galaxies
Stars and GalaxiesStars and Galaxies
Stars and Galaxies
duncanpatti
 
Galaxy presentation
Galaxy presentationGalaxy presentation
Galaxy presentation
Babubij
 

Viewers also liked (6)

Arau citroen -article 1
Arau   citroen -article 1Arau   citroen -article 1
Arau citroen -article 1
 
Galaxy Unit 2 (Grade 6)
Galaxy Unit 2 (Grade 6)Galaxy Unit 2 (Grade 6)
Galaxy Unit 2 (Grade 6)
 
Stars and Galaxies
Stars and GalaxiesStars and Galaxies
Stars and Galaxies
 
מצע מקוצר
מצע מקוצרמצע מקוצר
מצע מקוצר
 
Galaxies
GalaxiesGalaxies
Galaxies
 
Galaxy presentation
Galaxy presentationGalaxy presentation
Galaxy presentation
 

Similar to Galaxies for a 4th to 6th graders

Week 1 astronomy handout
Week 1 astronomy handoutWeek 1 astronomy handout
Week 1 astronomy handoutmark whiting
 
THE UNIVERSE
THE UNIVERSETHE UNIVERSE
THE UNIVERSE
Anas Asif
 
The Milky Way Galaxy Essay
The Milky Way Galaxy EssayThe Milky Way Galaxy Essay
The Milky Way Galaxy Essay
Kara Bell
 
Galaxies
GalaxiesGalaxies
Galaxies
RBAHENA29
 
Majorfeaturesoftheuniverseandie 090320145506-phpapp02
Majorfeaturesoftheuniverseandie 090320145506-phpapp02Majorfeaturesoftheuniverseandie 090320145506-phpapp02
Majorfeaturesoftheuniverseandie 090320145506-phpapp02Teach5ch
 
Supernova Persuasive Essay
Supernova Persuasive EssaySupernova Persuasive Essay
Supernova Persuasive Essay
Cindy Wooten
 
Blackhole.docx
Blackhole.docxBlackhole.docx
Blackhole.docx
HeiraSaisumiVezalliu
 
Major features of the universe andie
Major features of the universe andieMajor features of the universe andie
Major features of the universe andie
charsh
 
Major features of the universe andie
Major features of the universe andieMajor features of the universe andie
Major features of the universe andieJanelle Wilson
 
Major Features Of The Universe Andie
Major Features Of The Universe AndieMajor Features Of The Universe Andie
Major Features Of The Universe AndieTeach5ch
 
16 cosmology
16 cosmology16 cosmology
Cosmic dinosaurs globular clusters and their fate
Cosmic dinosaurs  globular clusters and their fate Cosmic dinosaurs  globular clusters and their fate
Cosmic dinosaurs globular clusters and their fate
wonderdome
 
Star Formation.pdf
Star Formation.pdfStar Formation.pdf
Star Formation.pdf
JendeeDelector
 
13 lives and deaths of stars
13 lives and deaths of stars13 lives and deaths of stars
13 lives and deaths of stars
Charisse Marie Verallo
 
Robots Astronauts And You
Robots Astronauts And You Robots Astronauts And You
Robots Astronauts And You
RoyB
 
Stars, Galaxies, and the Universe
Stars, Galaxies, and the UniverseStars, Galaxies, and the Universe
Stars, Galaxies, and the Universemlong24
 
Ryan ICT
Ryan ICTRyan ICT
Ryan ICT
AFJDS
 
Galaxies and stars
Galaxies and starsGalaxies and stars
Galaxies and starsJenny Dixon
 

Similar to Galaxies for a 4th to 6th graders (20)

Week 1 astronomy handout
Week 1 astronomy handoutWeek 1 astronomy handout
Week 1 astronomy handout
 
THE UNIVERSE
THE UNIVERSETHE UNIVERSE
THE UNIVERSE
 
Stars
StarsStars
Stars
 
The Milky Way Galaxy Essay
The Milky Way Galaxy EssayThe Milky Way Galaxy Essay
The Milky Way Galaxy Essay
 
Galaxies
GalaxiesGalaxies
Galaxies
 
Majorfeaturesoftheuniverseandie 090320145506-phpapp02
Majorfeaturesoftheuniverseandie 090320145506-phpapp02Majorfeaturesoftheuniverseandie 090320145506-phpapp02
Majorfeaturesoftheuniverseandie 090320145506-phpapp02
 
Supernova Persuasive Essay
Supernova Persuasive EssaySupernova Persuasive Essay
Supernova Persuasive Essay
 
Blackhole.docx
Blackhole.docxBlackhole.docx
Blackhole.docx
 
Major features of the universe andie
Major features of the universe andieMajor features of the universe andie
Major features of the universe andie
 
Major features of the universe andie
Major features of the universe andieMajor features of the universe andie
Major features of the universe andie
 
Major Features Of The Universe Andie
Major Features Of The Universe AndieMajor Features Of The Universe Andie
Major Features Of The Universe Andie
 
16 cosmology
16 cosmology16 cosmology
16 cosmology
 
Cosmic dinosaurs globular clusters and their fate
Cosmic dinosaurs  globular clusters and their fate Cosmic dinosaurs  globular clusters and their fate
Cosmic dinosaurs globular clusters and their fate
 
THE STARS
THE STARSTHE STARS
THE STARS
 
Star Formation.pdf
Star Formation.pdfStar Formation.pdf
Star Formation.pdf
 
13 lives and deaths of stars
13 lives and deaths of stars13 lives and deaths of stars
13 lives and deaths of stars
 
Robots Astronauts And You
Robots Astronauts And You Robots Astronauts And You
Robots Astronauts And You
 
Stars, Galaxies, and the Universe
Stars, Galaxies, and the UniverseStars, Galaxies, and the Universe
Stars, Galaxies, and the Universe
 
Ryan ICT
Ryan ICTRyan ICT
Ryan ICT
 
Galaxies and stars
Galaxies and starsGalaxies and stars
Galaxies and stars
 

Recently uploaded

June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
Levi Shapiro
 
CLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCE
CLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCECLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCE
CLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCE
BhavyaRajput3
 
The approach at University of Liverpool.pptx
The approach at University of Liverpool.pptxThe approach at University of Liverpool.pptx
The approach at University of Liverpool.pptx
Jisc
 
The French Revolution Class 9 Study Material pdf free download
The French Revolution Class 9 Study Material pdf free downloadThe French Revolution Class 9 Study Material pdf free download
The French Revolution Class 9 Study Material pdf free download
Vivekanand Anglo Vedic Academy
 
The geography of Taylor Swift - some ideas
The geography of Taylor Swift - some ideasThe geography of Taylor Swift - some ideas
The geography of Taylor Swift - some ideas
GeoBlogs
 
Digital Tools and AI for Teaching Learning and Research
Digital Tools and AI for Teaching Learning and ResearchDigital Tools and AI for Teaching Learning and Research
Digital Tools and AI for Teaching Learning and Research
Vikramjit Singh
 
Operation Blue Star - Saka Neela Tara
Operation Blue Star   -  Saka Neela TaraOperation Blue Star   -  Saka Neela Tara
Operation Blue Star - Saka Neela Tara
Balvir Singh
 
Overview on Edible Vaccine: Pros & Cons with Mechanism
Overview on Edible Vaccine: Pros & Cons with MechanismOverview on Edible Vaccine: Pros & Cons with Mechanism
Overview on Edible Vaccine: Pros & Cons with Mechanism
DeeptiGupta154
 
Additional Benefits for Employee Website.pdf
Additional Benefits for Employee Website.pdfAdditional Benefits for Employee Website.pdf
Additional Benefits for Employee Website.pdf
joachimlavalley1
 
Mule 4.6 & Java 17 Upgrade | MuleSoft Mysore Meetup #46
Mule 4.6 & Java 17 Upgrade | MuleSoft Mysore Meetup #46Mule 4.6 & Java 17 Upgrade | MuleSoft Mysore Meetup #46
Mule 4.6 & Java 17 Upgrade | MuleSoft Mysore Meetup #46
MysoreMuleSoftMeetup
 
Synthetic Fiber Construction in lab .pptx
Synthetic Fiber Construction in lab .pptxSynthetic Fiber Construction in lab .pptx
Synthetic Fiber Construction in lab .pptx
Pavel ( NSTU)
 
Palestine last event orientationfvgnh .pptx
Palestine last event orientationfvgnh .pptxPalestine last event orientationfvgnh .pptx
Palestine last event orientationfvgnh .pptx
RaedMohamed3
 
The Accursed House by Émile Gaboriau.pptx
The Accursed House by Émile Gaboriau.pptxThe Accursed House by Émile Gaboriau.pptx
The Accursed House by Émile Gaboriau.pptx
DhatriParmar
 
Model Attribute Check Company Auto Property
Model Attribute  Check Company Auto PropertyModel Attribute  Check Company Auto Property
Model Attribute Check Company Auto Property
Celine George
 
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
siemaillard
 
Guidance_and_Counselling.pdf B.Ed. 4th Semester
Guidance_and_Counselling.pdf B.Ed. 4th SemesterGuidance_and_Counselling.pdf B.Ed. 4th Semester
Guidance_and_Counselling.pdf B.Ed. 4th Semester
Atul Kumar Singh
 
Embracing GenAI - A Strategic Imperative
Embracing GenAI - A Strategic ImperativeEmbracing GenAI - A Strategic Imperative
Embracing GenAI - A Strategic Imperative
Peter Windle
 
Phrasal Verbs.XXXXXXXXXXXXXXXXXXXXXXXXXX
Phrasal Verbs.XXXXXXXXXXXXXXXXXXXXXXXXXXPhrasal Verbs.XXXXXXXXXXXXXXXXXXXXXXXXXX
Phrasal Verbs.XXXXXXXXXXXXXXXXXXXXXXXXXX
MIRIAMSALINAS13
 
Unit 2- Research Aptitude (UGC NET Paper I).pdf
Unit 2- Research Aptitude (UGC NET Paper I).pdfUnit 2- Research Aptitude (UGC NET Paper I).pdf
Unit 2- Research Aptitude (UGC NET Paper I).pdf
Thiyagu K
 
Lapbook sobre os Regimes Totalitários.pdf
Lapbook sobre os Regimes Totalitários.pdfLapbook sobre os Regimes Totalitários.pdf
Lapbook sobre os Regimes Totalitários.pdf
Jean Carlos Nunes Paixão
 

Recently uploaded (20)

June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...
 
CLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCE
CLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCECLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCE
CLASS 11 CBSE B.St Project AIDS TO TRADE - INSURANCE
 
The approach at University of Liverpool.pptx
The approach at University of Liverpool.pptxThe approach at University of Liverpool.pptx
The approach at University of Liverpool.pptx
 
The French Revolution Class 9 Study Material pdf free download
The French Revolution Class 9 Study Material pdf free downloadThe French Revolution Class 9 Study Material pdf free download
The French Revolution Class 9 Study Material pdf free download
 
The geography of Taylor Swift - some ideas
The geography of Taylor Swift - some ideasThe geography of Taylor Swift - some ideas
The geography of Taylor Swift - some ideas
 
Digital Tools and AI for Teaching Learning and Research
Digital Tools and AI for Teaching Learning and ResearchDigital Tools and AI for Teaching Learning and Research
Digital Tools and AI for Teaching Learning and Research
 
Operation Blue Star - Saka Neela Tara
Operation Blue Star   -  Saka Neela TaraOperation Blue Star   -  Saka Neela Tara
Operation Blue Star - Saka Neela Tara
 
Overview on Edible Vaccine: Pros & Cons with Mechanism
Overview on Edible Vaccine: Pros & Cons with MechanismOverview on Edible Vaccine: Pros & Cons with Mechanism
Overview on Edible Vaccine: Pros & Cons with Mechanism
 
Additional Benefits for Employee Website.pdf
Additional Benefits for Employee Website.pdfAdditional Benefits for Employee Website.pdf
Additional Benefits for Employee Website.pdf
 
Mule 4.6 & Java 17 Upgrade | MuleSoft Mysore Meetup #46
Mule 4.6 & Java 17 Upgrade | MuleSoft Mysore Meetup #46Mule 4.6 & Java 17 Upgrade | MuleSoft Mysore Meetup #46
Mule 4.6 & Java 17 Upgrade | MuleSoft Mysore Meetup #46
 
Synthetic Fiber Construction in lab .pptx
Synthetic Fiber Construction in lab .pptxSynthetic Fiber Construction in lab .pptx
Synthetic Fiber Construction in lab .pptx
 
Palestine last event orientationfvgnh .pptx
Palestine last event orientationfvgnh .pptxPalestine last event orientationfvgnh .pptx
Palestine last event orientationfvgnh .pptx
 
The Accursed House by Émile Gaboriau.pptx
The Accursed House by Émile Gaboriau.pptxThe Accursed House by Émile Gaboriau.pptx
The Accursed House by Émile Gaboriau.pptx
 
Model Attribute Check Company Auto Property
Model Attribute  Check Company Auto PropertyModel Attribute  Check Company Auto Property
Model Attribute Check Company Auto Property
 
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
 
Guidance_and_Counselling.pdf B.Ed. 4th Semester
Guidance_and_Counselling.pdf B.Ed. 4th SemesterGuidance_and_Counselling.pdf B.Ed. 4th Semester
Guidance_and_Counselling.pdf B.Ed. 4th Semester
 
Embracing GenAI - A Strategic Imperative
Embracing GenAI - A Strategic ImperativeEmbracing GenAI - A Strategic Imperative
Embracing GenAI - A Strategic Imperative
 
Phrasal Verbs.XXXXXXXXXXXXXXXXXXXXXXXXXX
Phrasal Verbs.XXXXXXXXXXXXXXXXXXXXXXXXXXPhrasal Verbs.XXXXXXXXXXXXXXXXXXXXXXXXXX
Phrasal Verbs.XXXXXXXXXXXXXXXXXXXXXXXXXX
 
Unit 2- Research Aptitude (UGC NET Paper I).pdf
Unit 2- Research Aptitude (UGC NET Paper I).pdfUnit 2- Research Aptitude (UGC NET Paper I).pdf
Unit 2- Research Aptitude (UGC NET Paper I).pdf
 
Lapbook sobre os Regimes Totalitários.pdf
Lapbook sobre os Regimes Totalitários.pdfLapbook sobre os Regimes Totalitários.pdf
Lapbook sobre os Regimes Totalitários.pdf
 

Galaxies for a 4th to 6th graders

  • 1. Why Am I Here?Why Am I Here? To tell you about what’s out there in theTo tell you about what’s out there in the Universe.Universe. I’m anI’m an astronomerastronomer, which is a kind of, which is a kind of scientist.scientist. I get to study stars and galaxies, and theyI get to study stars and galaxies, and they pay me to do it!pay me to do it!
  • 2. What do we call the star that isWhat do we call the star that is the nearest star to Earth… by far?the nearest star to Earth… by far?
  • 4. WhatWhat IsIs AA StarStar ?? Stars look bright and tiny to us, but theyStars look bright and tiny to us, but they areare huge dense balls of gashuge dense balls of gas lit up fromlit up from the inside by their own internal nuclearthe inside by their own internal nuclear power.power. All stars were born from gas and dust thatAll stars were born from gas and dust that collapsed into a fiery ball because ofcollapsed into a fiery ball because of gravity.gravity. Stars have different masses. TheStars have different masses. The heaviest are 100 times bigger than theheaviest are 100 times bigger than the lightest ones.lightest ones.
  • 5. The Sun is One of Many,The Sun is One of Many, Many Stars in Our GalaxyMany Stars in Our Galaxy
  • 6. What’s A Galaxy?What’s A Galaxy? A galaxy is a huge collection of stars,A galaxy is a huge collection of stars, held together in space by gravity.held together in space by gravity. Stars are very far apart and do notStars are very far apart and do not bump into each other.bump into each other.  Galaxies also have clouds of gasGalaxies also have clouds of gas and dust between the stars.and dust between the stars. Those clouds may make new starsThose clouds may make new stars one day, and recycle the dying ones.one day, and recycle the dying ones.
  • 7. What do we call the galaxy weWhat do we call the galaxy we live in?live in?
  • 8.
  • 9. The Milky Way isThe Milky Way is OurOur GalaxyGalaxy Why is it called “Why is it called “MilkyMilky”?”?
  • 10. What the Milky Way Looks Like from the Inside
  • 11. Where is the Sun inside theWhere is the Sun inside the Milky Way?Milky Way? TOP VIEW SIDE VIEW
  • 12. The Milky Way isThe Milky Way is OurOur GalaxyGalaxy Our galaxy contains about 200 billionOur galaxy contains about 200 billion stars – 200,000,000,000stars – 200,000,000,000 But the total mass of the galaxy is 5But the total mass of the galaxy is 5 times more than that.times more than that. Loose-floating gas & dust onlyLoose-floating gas & dust only account for “only” about another 200account for “only” about another 200 billion stars’ worth.billion stars’ worth. The galaxy is about the same age asThe galaxy is about the same age as the universe: 13 billion years old.the universe: 13 billion years old.
  • 13. The Andromeda Galaxy is similar to ours.
  • 15.
  • 17. The Hubble Ultra Deep Field