Download The Sun and Beyond - Valhalla High School

 Do Now: Write down five things you know
about the sun in your notes…
 Gives off energy in the form of
electromagnetic waves (see esrt p15)
 Luminous
 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
 8 planets (see esrt
p15)
 Meteors
 Asteroid Belt (Mars
and Jupiter
 Kuiper Belt (Pluto is
the king)
 Inner (rocky)
 Outer (gas giants)
 The Milky Way- our home
galaxy
 Milky Way Local GroupThe 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)
 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
)
 Consists of billions of stars clustered together
 Spiral shaped
 100,000 light years across
 Mapped by radiotelescopes –x-ray telescopes
(Chandra)
 Rotates
 Virgo Cluster- our local group
 Andromeda is the nearest galaxy to us
 Light years-distance light travels in one year
 10 trillion km
 Our universe is 25 billion light years in
diameter and 13-15 billion years old
 closest star to us is Proxima Centauri- 4.22
light years away
 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
 Yes
 Evidence for expansion was first provided by
Edwin Hubble- red shift (1929)
 And Background (cosmic
microwaves)Radiation from space (1964)
Light
Spectra
 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
 ???????
use the following to
determine....
Wrap up?
What is
our
Cosmic
Address?
Universe
Solar system
Milky way
Virgo cluster
USA
NY
Rm 227