Class_3_Earth_and_Space_B_Wu_Chen_new.pptx - LSGI1D03...

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LSGI1D03 Living on a Dynamic Earth Class 3 Earth and Space Part B Class 2 1
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Earth and Space Can we study Earth without consideration of the space immediately around it? What about the bigger space that goes beyond the Solar System? Some scientists go back to the origins of the universe in order to begin their study of Earth Is it necessary? Class 2 2
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Earth and Space Yes and no Earth is made up of matter Where does it come from? Matter interacts with matter Gravity, nuclear reactions, particle physics, chemical processes What external forces and events make Earth a dynamic place? Of course we could go all the way back to the start… Class 2 3
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Earth and Space Class 2 4 Earth is a part of the Solar System The Solar System is part of the Milky Way galaxy (the Galaxy) The Milky Way is one of galaxies in the universe Journey to the edge of the Universe (YouTube) How Big is the Universe (YouTube) A glimpse of the Milky Way Explore the Milky Way (YouTube) Beyond our Solar System (www)
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Earth and Space Of greater significance to how Earth works is the Solar System Sun Planets Moons Asteroids Comets Our Solar System (YouTube) Class 2 5 You can get an appreciation for the distances between the planets from this web site and an Earth-related appreciation here . Source
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Planet X Class 2 6 Does the solar system has: “Planet Nine”? The idea was proposed more than 100 years ago. Try to detect it by observe its gravity effects No directly evidence to prove it Cause of 27 million year cycle of mass exti nctions ?
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Kepler 22B Class 2 7 An earth-like planet 600 light year away from the earth Discovered in 2011
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The Sun Dark Secrets of the Sun (YouTube) Class 2 8
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The Sun The Solar System is dominated by the Sun A star Diameter: Mass: ( of Solar System mass) Composition: , Structure (GAS) Core Radiative zone Convective zone Photosphere Chromosphere Corona Class 2 9 Source
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The Sun The Sun (pdf) is a nuclear fusion reactor The source of (almost) all of Earth's energy Energy received : () Defines the electromagnetic spectrum Class 2 10 Where does the rest come from? Source
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The Sun The Sun also is the source of Solar Energetic Particles (SEP) Protons Electrons HZE ions (HZE = high charge and energy) Produced by Solar flares Coronal mass ejections Hazardous to life and technology Class 2 11 HZE ions also come from cosmic rays
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Sunspot Class 2 12 Sunspot: dark spot on the surface of the sun Due to strong magnetic field Reversal of magnetic poles (22 years) Affect the earth climate?
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Class 2 13
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Earth's orbit Class 2 14
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Earth's orbit Earth travels around the Sun in a path called an orbit Orbits are defined by Inertia Gravity Class 2 15
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Earth's orbit Inertia is the property of a body to resist change in its state of motion (Newton's First Law of Motion)
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