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Space, what is it good for?
Space, what is it good for?

... The dimensions of the galaxy, officially called M104, are as spectacular as its appearance. It has 800 million suns and is 50.000 light years across. ...
3_Ocean126_2006
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... Night-time observing (if applicable): major constellations, moon and planets, use of basic star charts. Naked eye, binocular and telescope viewing. Day-time observing (if applicable) of Sun, Moon, Venus and Jupiter (Note: Solar viewing will be via completely safe “projection” methods, and/or via nar ...
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... This program describes in appropriate detail, the characteristics of each planet, including the orbital characteristics and any other significant or unusual features of each planet. Particular emphasis is made to describe the differences between the terrestrial and the Jovian planets and how they f ...
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... Asteroids orbit the: Sun. Earth. Moon. all of these none of these Most meteors seen as shooting stars are about the size of: grains of sand. baseballs. small buildings. very large buildings. small continents. A small rock in interplanetary space is called a: meteor. meteoroid. meteorite. In a museum ...
PHS 111 Test 3 Review Chapters 26-28
PHS 111 Test 3 Review Chapters 26-28

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... There will be some Penumbral lunar eclipses coming up, but as the Moon will not pass through the main part of the Earth's shadow, there is not much to see, and if you didn't know that an eclipse was taking place you would not be aware of it. So we will have to wait for a decent lunar eclipse until ...
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... Clusters: gravitationally bound system of galaxies or stars o Stellar cluster: group of stars held together by gravitation in the same region of space, created roughly at the same time from the same nebulae o Open Cluster: Up to several hundred stars that are 10 billion years old or less. May still ...
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... astronomers use the shift of spectral lines produced by chemicals in the star’s atmosphere. Astronomers can also use the spectrum of a galaxy to tell how fast the galaxy is moving toward or away from Earth Using the principle of red shift, Edwin Hubble studied the relationship between a galaxy’s dis ...
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... • A giant cloud of dust and gas occupied this area of space – Many times larger than the present solar system – A lot of space between individual atoms of gas, metal and ions ...
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... in a distant galaxy. Clowes professor of science Robert Kirshner tracks such events, which can be brighter than a billion suns and suggest that cosmic expansion is accelerating. Opposite: A giant Jupiter-like extrasolar planet, seen from a moon. Orbiting very near their stars, with “years” measured ...
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... Match the Stage of the Life of a High Mass Star on the left with the best Descriptor on the right. Each Descriptor may be used only once. Stage of the Life of a High ...
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Earth Is Not the Center of the Universe
Earth Is Not the Center of the Universe

... Most of the celestial objects that are part of our solar system are constantly circling our sun. These circling paths are called orbits. All celestial objects have some amount of gravity, the attraction of one mass to another mass. Gravitational force is a measurement of the pull of gravity. Large ...
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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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