Terrestrial planets exam study notes

Terrestrial planets exam study notes - Terrestrial planets...

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Terrestrial planets exam study notes: - Old midterm questions: - The age of the oldest mineral on earth, zircon is 4.4 billion years old - The age of the oldest rocks from the Acasta Gneiss Complex is about 4 billion years old - Oldest rocks found on the moon are about 4.44 billion years old - The sun’s process of energy is created by the fusion process which burns hydrogen into helium - The Big Bang produced a lot of hydrogen and helium with a little bit of lithium and beryllium within the FIRST FEW SECONDS - The Big Bang happened about 13.7 billion years ago - Our sun is a G2 yellow dwarf star - The “main-sequence” of stars according to the Hertzsprung-Russell is called the hydrogen-helium fusion stage, which is the stage in which our sun is in now - Absolute magnitude is the magnitude of the star itself, apparent magnitude is just what it seems like - The further away you are from the star, the less bright that it seems - The star closest to our sun is Proxima Centauri – it is invisible to the naked eye because it is a very small dim red dwarf star with an apparent magnitude of only 11.5 - Until 1928, it was thought that the Andromeda Galaxy was a nebular cloud that was another Solar System in early stages of forming - Henriette Leavit and Edwin Hubble discovered a type of star called the Cepheid variable in order to show that it was a large galaxy at a very great distance - The estimate of the number of stars in our galaxy is about 200 billion - The universe became transparent to light about 380 000 yrs ago - Heliocentric model of the solar system sees the solar system as if we were looking at the planets from the place with the sun at the centre - Hydrogen accounts for most of the mass in the solar system, it is mostly what the sun is made of - The sun accounts for 98% of the mass in the solar system - Oxygen is most abundant in the rocks of the earth and the outer part of the earth
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- Iron is the most common element on earth (mostly in the core) - Iron is found almost all in the earth’s core - The Andromeda Galaxy is a spiral galaxy like the Milky Way and it has about 200 billion stars - Geodynamo: liquid iron in the Earth’s outer core is driven into circulation by heat from below, liquid moves through the existing magnetic field, electric currents are induced which create the maintenance of the magnetic field - The Moon’s surface rocks have more iron than those on earth because a collision between the Earth and avery large impactor after the earth had already been largely differentiated - Our sun formed about 4.6 billion years ago when a nebular cloud of hydrogen, helium and a dust of minerals collapsed under gravity into a central proto-star that became our sun The four terrestrial planets (Mercury, Venus, Mars and Earth) formed from mineral dusts and are made mostly (more than 90%) of iron, silicon, oxygen and magnesium These four elements form the mineral olivine - The asteroid belt is beyond Mars - Jupiter and Saturn are the gas giant planets - Uranus and Neptune are the water giant planets
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Terrestrial planets exam study notes - Terrestrial planets...

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