The Solar SystemPROJECT BYBHAVANA

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

Neptune

• Eighth planet form the Sun

• Four times larger in diameter than the Earth

• Blue in color

Pluto• Ninth planet from

the Sun• Smallest of the

planets• Coldest planet• But now it is not

considered as a planet.

Let’s compare the planets to Earth

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

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