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Introduction
• A solar system consists of a star and objects that revolve around it.
• Our Solar System consists of the Sun and nine known planets and the moons that orbit those planets.
• The force of gravity keeps planets in orbit around the sun.
The Sun
• It is over one million times larger than Earth.
• It is eight light minutes away from Earth or 92,957,000 miles.
• The temperature is 15 million degrees K. One K = 13-25 million degrees!
The Nine Known Planets Inner Planets
Outer Planets
• Mercury
• Venus• Earth• Mars
• Jupiter• Saturn• Uranus• Neptune• Pluto
Mercury
• Closest planet to the sun
• Approximately half the size of Earth
• Rocky surface covered by craters
• No water or air results in unchanged appearance
• Surface temperatures are hot enough to melt lead
Uranus
• Seventh planet from the Sun
• Four times larger in diameter than the Earth
• Blue-green in color• The tilt of the axis
causes sunlight for 42 years at a time
Venus
• Second planet from the Sun
• Approximately the same size as the Earth
• Atmosphere consists of poisonous gases
Earth
• Third planet from the Sun
• Largest of the four inner planets
• Only planet where life is known to exist
• 70% of the surface is covered by water
Mars
• Fourth planet from the Sun
• Approximately half the size of Earth
• Known as the Red Planet
• Has four seasons similar to Earth
• Resembles Earth more than any other planet
Jupiter
• Fifth planet form the Sun
• Largest planet in our Solar System
• 1300 Earths could fit inside Jupiter
• Doesn’t have a surface; made of gases
Saturn
• Sixth planet from the Sun
• Second largest planet
• 800 Earths could fit inside Saturn
• Thousands of rings are made up of ice and rock fragments
Pluto
• Ninth planet from the Sun
• Smallest of the planets
• Coldest planet• But now it is not
considered as a planet.
A day on :
Mercury = 3 Earth monthsVenus = 117 Earth daysMars = 41 minutes longer than
an Earth dayJupiter = 10 Earth hoursSaturn = 10 ½ Earth hoursUranus = 13 ½ Earth hoursNeptune = 18 Earth hoursPluto = 7 Earth days
OUR SOLAR SYSTEM
• Our solar system consists of:• 1 star , 8 planets, 63 (major) moons , asteroids, comets, meteoroids
The Orbital Speed of the Planets
• Mercury = 30 miles per second• Venus = 22 miles per second• Earth = 19 miles per second• Mars = 15 miles per second• Jupiter = 8 miles per second• Saturn = 6 miles per second• Uranus = 4.2 miles per second• Neptune = 3.3 miles per second• Pluto = 2.9 miles per second
Therefore, the further away from the Sun, the slower the orbital speed.
The Earth has one Moon. How many moons do the other planets
have?• Mercury - 0• Venus - 0• Mars - 2• Jupiter - 17• Saturn - 22• Uranus - 15• Neptune - 2• Pluto - 1• The Moon
It takes 365 days for Earth to revolve around the Sun.
How long does it take the other planets?
• Mercury - 88 Earth days• Venus - 225 Earth days• Mars - about 2 Earth years• Jupiter - 11.8 Earth years• Saturn - 30 Earth years• Uranus - 84 Earth years• Neptune - 165 Earth years• Pluto - 248 Earth years