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previous mid-term () - Department of Physics and Astronomy
previous mid-term () - Department of Physics and Astronomy

... 47. For a star moving away from the Solar System, the absorption and emission lines of the electromagnetic radiation spectrum will be Doppler shifted, that is a. reversed so that red wavelengths will become blue and blue wavelengths will become red ones. b. blueshifted, that is, shifted toward short ...
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Chapter 25.1: Models of our Solar System
Chapter 25.1: Models of our Solar System

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WINNING STORY - Atlantis Short Story Contest
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History of the Universe and Solar System
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Chapter 15 Stars, Galaxies
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... most celebrated as the first to propose a sun-centered universe. He is also famed for his pioneering attempt to determine the sizes and distances of the sun and moon. According to his contemporary, Archimedes, Aristarchus was the first to propose not only a heliocentric universe, but also one larger ...
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... 3. A planet’s gravity is caused by its spin. False A planets gravity is caused by its mass. 4. Fusion is the process that powers the Sun and other Stars. True 5. A black hole is the beginning stage of every massive star. False. A black hole is the ending stage of a massive star. 6. A nebula is a vas ...
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Chapter 25.1: Models of our Solar System

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PES 106 – General Astronomy II – Final Study Guide
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... The Universe What is primary meaning of Hubble’s Constant? What is the cosmic horizon? How does light behave in an expanding universe? How does the underlying shape of the universe affect a “straight” line? About how old do we think the universe is? How can very old stars and galaxies cause an age d ...
The Solar System - Astronomy - The University of Texas at Austin
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The expanding universe
The expanding universe

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Document
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Charting The Universe - University of Windsor
Charting The Universe - University of Windsor

... lunatic, jovial, martial, disaster, influenza ...
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Outer space



Outer space, or just space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation from the Big Bang, is 2.7 kelvin (K). Plasma with a number density of less than one hydrogen atom per cubic metre and a temperature of millions of kelvin in the space between galaxies accounts for most of the baryonic (ordinary) matter in outer space; local concentrations have condensed into stars and galaxies. In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe is a poorly understood vacuum energy of space which astronomers label dark energy. Intergalactic space takes up most of the volume of the Universe, but even galaxies and star systems consist almost entirely of empty space.There is no firm boundary where space begins. However the Kármán line, at an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit.Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches. Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961 and unmanned spacecraft have since reached all of the known planets in the Solar System. Due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon.Outer space represents a challenging environment for human exploration because of the dual hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to these health and environmental issues, the economic cost of putting objects, including humans, into space is high.
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