Transcript sun and seasons

Warm Up: May 2, 2012
Life on Earth could not exist
without one thing.
1) What is it?
2) AND explain why life could not
exist without it.
 The student will be able to
explain the physical behavior
of the environment, Earth,
and the universe.
Sun and Season
Chapter 29 and 26(sec. 2)
The Sun
- our average middle-age yellow star contains
more than 99% of all the matter in the solar
system. (center of the solar system)
The Sun produces energy by the
nuclear fusion of hydrogen into
helium; this takes place in its core.
Sun produces
energy from
nuclear reactions
 holds all planets in orbit by its gravity
 provides almost all energy found on
Earth
 made of gas 70% hydrogen 29%
helium 1% other gases
 Distance from Earth = 93 million miles or
150 million kilometers.
The distance from Earth to the sun is called
an Astronomical Unit – (A.U.)
 it takes 8 minutes for light to travel this
distance.
 Diameter of the sun is 110 times the
diameter of the Earth.
Sun
Sun Flare
 Mass is 333,000 times greater than
Earth.
 Density = ¼ that of Earth – reason why sun
is less dense than the Earth is because it is a
ball of gas
SUN AND SEASONS
 http://prezi.com/l_c1zg274e9e/the-sun-ampseasons/
 http://prezi.com/gevshvlv-omj/the-sun/
Short video reviewing facts
about our “star” and new
information also. You may wish
to take notes.
Thank you to Science Teacher
Tony Goodyear
for help in creating this PPT.
 That’s Mr. Goodyear holding the sun!