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The Sun and Beyond…. The Sun. Do Now: Write down five things you know about the sun in your notes…. Our Closest Star: The Sun. Gives off energy in the form of electromagnetic waves (see esrt p15) Luminous

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the sun
The Sun

Do Now: Write down five things you know about the sun in your notes…

our closest star the sun
Our Closest Star: The Sun

Gives off energy in the form of electromagnetic waves (see esrt p15)


Can be classified according to the Hertzsprung-Russel Diagram (our sun is a typical star)

Energy produced by the nuclear fusion of 2 hydrogen atoms to helium

Takes 27 days to rotate


Sunspots were first observed by Galileo

Cooler areas on the surface of the sun

Occur in a cyclic manner-every 11 years reach a maxima or a minima

our solar system
Our Solar System

8 planets (see esrt p15)


Asteroid Belt (Mars and Jupiter

Kuiper Belt (Pluto is the king)

Inner (rocky)

Outer (gas giants)

moving out of our solar system
Moving out of our Solar System

The Milky Way- our home galaxy

Milky Way Local Group-The Milky Way is not an island universe, but a member of a small cluster of galaxies called the Local Group. The Local Group contains about 3 dozen known galaxies, clumped in two subgroups around two massive spiral galaxies --the Milky Way, and the Andromeda Galaxy. In several billion years it is possible that the Milky Way and Andromeda will collide and merge to form one huge elliptical galaxy.(Credit: NASA/CXC/M.Weiss)

the milky way

Milky Way Galaxy: Face-on ViewSchematic, face on illustration of the Milky Way galaxy, showing the prominent spiral arms, the central galactic bulge and the location of the Sun. (labeled & unlabeled) (Credit: NASA/CXC/M.Weiss)

about the milky way galaxy
About the Milky Way Galaxy

Consists of billions of stars clustered together

Spiral shaped

100,000 light yearts across

Mapped by radiotelescopes –x-ray telescopes (Chandra)


Virgo Cluster- our local group

Andromeda is the nearest galaxy to us

distance in space
Distance in space…

Light years-distance light travels in one year

10 trillion km

Our universe is 25 bilion light years in diameter and 13-15 billion years old

closest star to us is Proxima Centauri- 4.22 light years away

the big bang theory
The Big Bang Theory

Proposed by George LeMaitre (a roman catholic priest) 1927

Says universe began from a primordial hot and dense state which exploded material out into space

Is still expanding outward today

is the universe expanding
Is the Universe Expanding?


Evidence for expansion was first provided by Edwin Hubble- red shift (1929)

And Background (cosmic microwaves)Radiation from space (1964)


Doppler Effect: The apparent change in the wavelength of radiation or sound in which there is a relative motion between the source and the receiver



so many questions
So many questions…

Science tries to answer them all

What is the fate of our universe? Will it continue to expand or undergo the Big Crunch?

There are many models to that try to explain this


wrap up
Wrap up?

use the following to determine....


Solar system

Milky way

Virgo cluster



Rm 227

What is our Cosmic Address?