Download Our Solar System

Our Solar System
S8.D.3.1.1-3
1
Universe
Galaxy
2
3
)Milky Way Galaxy (Our Galaxy)
4
• Universe All of the matter and energy that exists
 Everything (all of outer space)
There are more stars in Universe than
grains of sand in the world
• Galaxy
 collection of stars and nebula
 contains 100’s of billions of stars
 Nebula cloud of dust and gas which
condenses to form a new star
5
• Solar System- contains:
(1) one star (sun)
(2) planets, dwarf planets, moons
(3) Asteroids, comets, meteoroids
6
Solar System
• The Sun is Earth’s closest star
• The Sun is the most massive body in our Solar
System
•The sun is an average-size star in the Milky Way
7
Galaxy
How The Sun Produces Energy:
Nuclear Fusion
• Hydrogen atoms fuse to
form helium atoms
• Lots of energy is given off in
the process (7 forms of EM
Radiation)
• H + H  He + energy
Opposite of Nuclear Fission
8
9
What Happened To Pluto?
in Aug. 2006 IAU (International Astronomical Union) changed the
definition of a planet
PLANET
• Orbits the Sun
• Nearly Round
• Clears its own orbital
path around the Sun
DWARF PLANET
• Orbits the Sun
• Nearly Round
• Does not clear its own
path around the Sun
• Now have 8 planets
• 5 Dwarf Planets so far
(hundreds more to come)
• Ceres, Pluto, Haumea,
Makemake, Eris
10
Inner Planets vs Outer Planets
•
•
•
•
•
•
•
•
•
•
Small and Rocky
Solid Surface
Low mass
High Density
Close to sun
Closely spaced orbits
Few moons (if any)
No rings
Terrestrial Planets
Mercury,Venus,Earth,Mars
Size of planets video clip
•
•
•
•
•
•
•
•
•
•
Large and Gaseous
No solid surface
High mass
Low Density
Far from sun
Separated orbits
Many moons
Many rings
Gas giants
Jupiter,Saturn, Uranus,
Neptune
Size of planets video clip #2
11
Mercury
• Surface resembles the moon’s
• No Moon or Atmosphere (very thin, hardly any)
• Shortest Year (88 E days)Revolves faster than any other
planet (107,000 mph) and has the shortest distance to travel
around the Sun
• Long Day Rotates slowly takes 59 E. days
• Temperature Range (greatest of any planet)
High = 800F Low = -290F
*Days and nights are long, so it has lots of time to heat up and cool down.
12
Venus
•
No Moon
• Atmosphere
• Very thick clouds made of CO2 and Sulfuric Acid
• Atmospheric pressure is 90x greater than Earth’s
• Severe Greenhouse Effect because of thick Carbon Dioxide
• Hottest Planet @ 900 F
• It rains Sulfuric Acid
• Day (Longest of any Planet) 243 E. Days
• Year  225 E. Days
**Day is Longer than a Year on Venus**
13
Mars
NASA Planet Fact Site
• The Red Planet, because of the iron oxide (rust) in its soil
• Day= 24.5 hrs
• Year= 1.9 Earth Years
• Diameter = about ½ Earth
• Less
gravity than on Earth
• No Liquid water today, although it is thought to have had water
and thicker atmosphere in the past. Evidence of dried riverbeds
and erosion exists.
• A change in climate could be tied to atmospheric changes
•
2 Moons:
1. Phobos (14 miles)
2. Deimos (8 miles)
 probably captured asteroids
14