A look at Our Solar System
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A look at Our Solar System
description
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. - PowerPoint PPT Presentation
Transcript of A look at Our Solar System
A look atOur Solar System
It all starts with …..
ARISTOTLE
GEOCENTRIC MODEL – everything revolves
around earth.
Ptolomy –Orbits werePerfect 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.
MERCURYThe 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.
VENUSCovered 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
EarthTwo 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
MARSSurface 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 beenpresent
GAS GIANTSLarger outer planets
Separated from terrestrial planets by an asteroid belt
No solid surface, thick gaseous atmospheres
All have rings and satellites
JUPITERAtmosphere 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.
SATURNSpectacular system of rings
It radiates 3 times more energy than it receives from the sun, so it may still be forming
URANUS AND NEPTUNESimilar in size to one another.
Blue color is due to methane gas in their atmosphere.
PLUTO1930 – 2011 RIP
