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A look at Our Solar System PowerPoint PPT Presentation


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A look at Our Solar System. It all starts with …. ARISTOTLE. GEOCENTRIC MODEL – everything revolves around earth. Ptolomy – Orbits were Perfect circles. Nicolaus Copernicus. Heliocentric model – all planets revolve around the sun. He’s back – Issac Newton.

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A look at Our Solar System

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A look at

Our Solar System


It all starts with …..

ARISTOTLE


GEOCENTRIC MODEL – everything revolves

around earth.


Ptolomy –

Orbits were

Perfect circles.


Nicolaus Copernicus


Heliocentric model – all planets revolve around the sun


He’s back – Issac Newton


Gravitational forces keep planets in an orbit around the sun.


It all started about 4.6 billion years ago….

At least that’s what we think


The Nebular Model

Remember – a nebula is a large cloud of dust and gas in space. It is where stars are born or where they explode at the end of their lives


Nebula begins to collapse

Begins to rotate and flatten

Accreation- collision of particles - occurs in the disk. Planets form.


The TERRESTRIAL PLANETS are the ones closer to the sun. Since they were close to the sun, gas and dust did not join together easily. Intense radiation from the sun exerted pressure on these planets, and cause them to loose their lighter materials.

GAS GIANTS formed farther away from the sun, where gas and dust joined easily. These planets were LARGE enough and COLD enough to hold light nebular gases, such as hydrogen and helium in their atmospheres.


Inner planets in our solar system are called TERRESTRIAL PLANETS

Rocky like earth

Have higher temperatures, because they receive more of the sun’s radiation.

The distance in the solar system is measured in astrological units (au) or the distance from the sun to the earth.


MERCURY

The closest planet to the sun

Temperature extremes. Can go from 670 Kelvin to 103 Kelvin at night

Spin slowly on it’s axis. I day on Mercury equals 176 earth days.


VENUS

Covered in thick carbon dioxide clouds.

Causes a runaway greenhouse effect. The surface temperature is over 700 Kelvin

Its atmosphere contains large amounts of sulfuric acid.

One day equals 117 earth days


Earth

Two things allow life to exist

Hydrosphere – all the water on the earth’s surface

The atmosphere – made of mostly nitrogen, it helps moderate temperature, and protects against uv radiation and space debris


MARS

Surface is red from iron oxide

Frozen carbon dioxide polar ice caps

Home to the largest volcano in the solar system

Feature indicate water may have once been

present


GAS GIANTS

Larger outer planets

Separated from terrestrial planets by an asteroid belt

No solid surface, thick gaseous atmospheres

All have rings and satellites


JUPITER

Atmosphere consists of swirling clouds of hydrogen, helium, methane, and ammonia

Largest planet in the solar system

Giant Red Spot is a huge hurricane which measures over 2 earth diameters wide.


SATURN

Spectacular system of rings

It radiates 3 times more energy than it receives from the sun, so it may still be forming


URANUS AND NEPTUNE

Similar in size to one another.

Blue color is due to methane gas in their atmosphere.


PLUTO

1930 – 2011 RIP


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