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Passport Science Space Unit

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Title: Space Unit: The Solar System Author: Liberty Public Schools Last modified by: dabrams Created Date: 11/3/2003 4:11:09 PM Document presentation format – PowerPoint PPT presentation

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Title: Passport Science Space Unit


1
Passport Science Space Unit Part 2 of 3
PowerPoints(Textbook reference Chapters 12, 13,
14, 15 and 16)
2
The Sun (Textbook reference 14-2
  • The sun is an ordinary star.
  • The sun is the biggest, brightest, and hottest
    object in the solar system.
  • Its energy is the result of the fusion of
    hydrogen nuclei into helium nuclei.
  • The sun is made of about 70 hydrogen and 28
    helium.

3
Our Sun is a star that has already spent about 5
billion years on the main sequence.
Scientist believe our Sun is roughly
halfway through it's life.
Source The British Astronomical Association
4
Characteristics of the Sun
  • Interior Core, Radiation Zone, Convection Zone
  • Exterior Photosphere, Chromosphere, Corona
  • Features Sunspots, Prominences, Solar Flares
  • Central star in our solar system around which
    planets revolve
  • Composed of gases (H2 and He) burning at
    15,000,000 o C

5
The Sun Seasons (Textbook Reference 12-1)
Seasons Solstices sun directly
overhead two times a year (June 21 and December
21) Junelongest day, Decembershortest
day Equinoxes halfway between
solstices neither hemisphere is tilted toward
the sun daylight and darknessequal
6
What causes the seasons?
  1. 23.5 tilt of Earths axis
  2. Direct vs. indirect sun rays
  3. Length of daylight

7
In one year the earth revolves around the sun one
time.
Fall
Summer

For every time Earth rotates on its axis, one
day passes. In one year the earth rotates on
its axis one 365 times.
Sun
Spring
Winter
Which season is it when the south end of Earths
axis is tilted toward the sun?
8
Earths Moon
Stars are the source of light for all objects in
outer space
9
Phases of the Moon (Textbook reference 12-3)
waxing increasing waning
decreasing gibbous gt ½ crescent lt
½
10
Lunar Phases
  • New Moon
  • Waxing Crescent
  • First Quarter
  • Waxing Gibbous
  • Full Moon

11
Lunar Phases
  • Full Moon
  • Waning Gibbous
  • Last Quarter
  • Waning Crescent
  • New Moon

12
Rotate vs. Revolve
  • Rotation spin of an object on its axis
  • Revolution orbit of an object around another
    object

13
Moons Orbit and Phases
14
Why does one side of the moon always face us?
  • Moon rotates once every 27.3 days
  • Moon revolves once every 29.5 days
  • Moons rotation approximately equal to its
    revolution

15
Eclipses
  • Lunar Eclipse
  • Solar Eclipse
  • Total Eclipse

16
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17
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18
A total eclipse of the sun occurs during the day!
Only the corona is visible.
19
Tides
  • Effect of gravity between the moon and the sun

20
Spring Tides
  • When the sun, the moon, and the Earth are all
    aligned in a 180o angle

21
Neap Tide
  • When the sun, the moon, and the Earth form a 90
    angle
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