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Square Kilometre Array
Book article from: A Dictionary of Astronomy
Square Kilometre Array ( SKA ) An internationally owned and operated radio telescope that, when completed, will have a collecting area of 1 million...
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Mars
Book article from: A Dictionary of Astronomy
...plains of lava stretching for hundreds of kilometres. Impact craters are widespread on Mars...800 km long and several kilometres wide. Direct evidence that liquid water...probably has a lithosphere hundreds of kilometres thick, a rocky asthenosphere, and...
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cosmic-ray shower
Book article from: A Dictionary of Astronomy
...particles. The resulting shower can cover an area several kilometres wide at ground level, depending on the energy of the particle...single cosmic ray of energy 10 19 eV will cover 10 square kilometres and contain 10 billion particles at ground level.
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A-subduction
Book article from: A Dictionary of Earth Sciences
...in which oceanic lithosphere subducts. A-subduction is postulated to involve shortening of a maximum of only a few hundred kilometres, whereas B-subduction can recycle thousands of kilometres of oceanic crust and upper mantle.
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Letters from the Front, World War I (1918, by Quentin Roosevelt)
Dictionary entry from: Dictionary of American History
...to patrol at thirty-five hundred metres over about a ten kilometre sector where some sort of straightening the line action was...and started over across, hunting for trouble. A couple of kilometres inside the line we spotted six of them about a thousand metres...
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Venus
Book article from: A Dictionary of Astronomy
...at present. There are many circular structures hundreds of kilometres across, called coronae , which appear to be super-volcanoes...longer, sometimes winding away from the crater for hundreds of kilometres like lava. Greater impact melt due to the higher temperatures...
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quiescent prominence
Book article from: A Dictionary of Astronomy
...changing little in appearance. Quiescent prominences are arch-shaped, several hundred thousand kilometres long, a few thousand kilometres thick, and up to 50 000 km high. When seen against the solar disk they appear...
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chaotic orbit
Book article from: A Dictionary of Astronomy
...massive planet such as Jupiter, its post-encounter path will differ by millions of kilometres if the fly-by distance is altered by only a few hundred kilometres. The outcomes of such encounters are essentially unpredictable. The orbit of the...
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very long baseline interferometry
Book article from: A Dictionary of Astronomy
...in radio interferometry where telescopes, often many thousands of kilometres apart, may be operated as an interferometer to achieve angular resolutions...telescopes will extend VLBI baselines to hundreds of thousands of kilometres.
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canale
Book article from: A Dictionary of Astronomy
...plains and have near-constant cross‐sections and widths. They are typically a few hundred kilometres long and a few kilometres wide, Baltis Vallis being the longest at 6800 km. The smoothness and great length of canali...
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