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At Earth's orbit its typical density is 6 ions / cm < SUP > 3 </ SUP > ( variable, as is the velocity ), and it contains a variable interplanetary magnetic field ( IMF ) of ( typically ) 2 – 5 nT.
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At and Earth's
At one astronomical unit from the sun ( the Earth's distance ) the dust orbits are probably nearly circular.
At the peak of the Cretaceous transgression, one-third of Earth's present land area was submerged.
At the Survey, he worked mainly in geodesy and gravimetry, refining the use of pendulums to determine small local variations in the Earth's gravity.
At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground.
At the close of the 20th Century, all of the Earth's kaiju have been collected and confined in an area known as Monster Island, by the United Nations Science Committee, in the Ogasawara island chain.
At its height, the British Empire covered a quarter of the Earth's land area and comprised a quarter of its population.
The idea was used by Edgar Rice Burroughs, the creator of Tarzan, in the seven-novel " Pellucidar " series, beginning with At the Earth's Core ( 1914 ).
At that time it had lost the first page, but the second ( the current beginning of the Ynglinga Saga ) starts Kringla heimsins, " the Earth's circle " of the Laing translation.
At Standard Sea Level conditions ( corresponding to a temperature of 15 degrees Celsius ), the speed of sound is 340. 3 m / s ( 1225 km / h, or 761. 2 mph, or 661. 5 knots, or 1116 ft / s ) in the Earth's atmosphere.
At 10-15 kilometers ( 6 – 9 miles ) above the Earth's surface, the absorption of sunlight would further heat the smoke, lifting some, or all of it, into the stratosphere, to where the smoke would persist for years, with no rain to wash it out.
At 165. 25 million square kilometres ( 63. 8 million square miles ) in area, this largest division of the World Ocean – and, in turn, the hydrosphere – covers about 46 % of the Earth's water surface and about one-third of its total surface area, making it larger than all of the Earth's land area combined.
At first, oxygen would quickly combine with other elements in Earth's crust, primarily iron, as it was produced.
# At the Earth's Core ( 1914 )
The first novel was filmed as At the Earth's Core ( 1976 ), directed by Kevin Connor and starring Doug McClure as David Innes and Peter Cushing as Abner Perry.
* At the Earth's Core ( 1976 movie )
Image: AtTheEarthsCore. jpg | At the Earth's Core-1960s paperback
At, Russia is the largest country in the world, covering more than one-eighth of the Earth's inhabited land area.
At standard temperature and pressure, radon forms a monatomic gas with a density of 9. 73 kg / m < sup > 3 </ sup >, about 8 times the density of the Earth's atmosphere at sea level, 1. 217 kg / m < sup > 3 </ sup >.
At the measured distance of Vega, this corresponded to an actual radius of 80 astronomical units ( AU ), where an AU is the average radius of the Earth's orbit around the Sun.
At high latitudes ( near the Earth's poles ), they are very low, making communication difficult or impossible due to factors such as atmospheric refraction, Earth's thermal emission, line-of-sight obstructions, and signal reflections from the ground or nearby structures.
At that point in Earth's history these rocks made up the soft bottom sediments of a large, shallow ocean, which stretched across much of North America.
At the Earth's surface, earthquakes manifest themselves by vibration, shaking and sometimes displacement of the ground.
At and orbit
At Yalta the West still believed that Eastern Europe could be kept in its orbit, in spite of the onrushing Soviet armies.
At the time of Kennedy's proposal, only one American had flown in space — less than a month earlier — and NASA had not yet sent an astronaut into orbit.
At this point, during tests of the CSM's steerable rocket engine in preparation for the burn to modify the craft's orbit, a malfunction occurred in the engine's backup system.
At that time, the orbit of Shoemaker – Levy 9 passed within Jupiter's Roche limit, and Jupiter's tidal forces had acted to pull the comet apart.
At these points, the combined attraction from the two masses is equivalent to what would be exerted by a single mass at the barycenter of the system, sufficient to cause a small body to orbit with the same period.
At even higher low earth orbit altitudes atomic oxygen is a significant presence and a cause of erosion for spacecraft.
At a specific velocity called escape velocity, again dependent on the firing height and mass of the planet, an open orbit such as ( E ) results — a parabolic trajectory.
At this distance, the dust belt may be analogous to the Kuiper belt that lies outside the orbit of Neptune in the solar system.
At a cost of $ 62. 8 million, the 19-month mission was put into a low polar orbit of the Moon, accomplishing mapping of surface composition and possible polar ice deposits, measurements of magnetic and gravity fields, and study of lunar outgassing events.
At one stage there was a threat that the Iridium satellites would have to be de-orbited ; however, they remained in orbit and operational.
At 11. 12pm GMT on 30 November 1968, the first three-stage Europa 1 launcher put a 550 lb Italian satellite-model into orbit.
At a 1954 meeting of the Spaceflight Committee of the American Rocket Society, von Braun proposed placing a satellite into orbit using the Redstone with clusters of small solid-fuel rockets on top.
At the beginning of its journey, the spacecraft will already have a certain velocity associated with its orbit around Earth – this is the velocity that will not need to be found when the spacecraft enters the transfer orbit ( around the Sun ).
At the other end, the spacecraft will need a certain velocity to orbit Mars, which will actually be less than the velocity needed to continue orbiting the Sun in the transfer orbit, let alone attempting to orbit the Sun in a Mars-like orbit.
At the start of Vostok 3's thirty-third orbit this distance had diverged to, and to at the start of the sixty-fourth.
At one point the craft came within a few kilometers of each other and Popovich later reported at a news conference that he saw the other craft from orbit.
At the time of his flight, Beregovoy was 47 years of age: he was the earliest-born human to go to orbit, being born three months and three days earlier than the second earliest-born man in orbit – John Glenn, but later than X-15 pilot Joe Walker who made 2 ( or 3, according to USAF definition ) suborbital space flights.
At this time, all the known comets had an orbital period of seventy years and more, with an aphelion far beyond the orbit of Uranus.
At and its
Having hedged its bets in this way, PHS apparently decided it would be possible to make some sort of determination after all: `` At present radiation levels, and even at somewhat higher levels, the additional risk is slight and very few people will be affected ''.
At the end of its letter was the information that applicants for this position `` must also be prepared to teach costume design and advertising art ''.
At the present time we do not know by what biochemical mechanism TSH acts on the thyroid, but for bio-assay of the hormone there are a number of properties by which its activity may be estimated, including release of iodine from the thyroid, increase in thyroid weight, increase in mean height of the follicular cells and increase in the thyroidal uptake of Af.
At about the time the Marsden enterprise was getting under way, the Vail Light and Lumber Company started construction of a chair stock factory on the site of the present Bennington Co-operative Creamery, intending to use its surplus power for generating electricity.
At its best the abstract expressionists achieve a simple rococo decorative surface.
At its most ecstatic moments, husband and wife are elevated far above worldly cares.
At the same time, there is a good deal of self-congratulation at attending a good college -- they are even inclined to exaggerate its not inconsiderable virtues -- and they express pleasure at the cozy in-group feeling that the college generates.
At last count, sixteen former Rhodes Scholars ( see box on page 13 ) had been appointed to the Administration, second in number only to its Harvard graduates.
At the State Department, hard-bitten Russian experts complained that the Capitol was out of its wits.
At each angle of its pitch a big skylight had been fitted into the roof and all these skylights were fitted with systems of multiple screens and shades.
At first the Belgian royal family administered the Congo as its own private property.
At war's end leadership in Western Europe passed from Britain because the Labour Government devoted its attention to the creation of a welfare state.
At the feeding station, the raffish group of cowbirds again bobbed and gobbled over the ground, but now, gorgeous among them, was a beautiful red cardinal, radiant in its feathered vestments.
At its 1864 convention, the Republican Party selected Andrew Johnson, a War Democrat from the Southern state of Tennessee, as his running mate.
" At its worst, Scheler says, " love for the small, the poor, the weak, and the oppressed is really disguised hatred, repressed envy, an impulse to detract, etc., directed against the opposite phenomena: wealth, strength, power, largesse.
At the start of a new industrial age in the 18th century, it was believed that " people are the riches of the nation ", and there was a general faith in an economy that paid its workers low wages because high wages meant workers would work less.
At the same time, Angola has promoted the revival of the Community of Portuguese-Speaking Countries ( CPLP ) as a forum for cultural exchange and expanding ties with Portugal ( its former ruler ) and Brazil ( which shares many cultural affinities with Angola ) in particular.
At this level we do not need to mention how the machine manages its tape or head.
At the time, the periodic table had been restructured by Seaborg to its present layout, containing the actinide row below the lanthanide one.
Some sources state that At < sub > 2 </ sub > does not exist, or at least has never been observed, while other sources assert or imply its existence.
At the peak of its efficiency in the early 16th century, the Venetian Arsenal employed some 16, 000 people who apparently were able to produce nearly one ship each day, and could fit out, arm, and provision a newly-built galley with standardized parts on an assembly-line basis not seen again until the Industrial Revolution.
At the end of this period, not longer than one year, the soul then takes its place in the World to Come.
Allotropes of iron, ( alpha iron and gamma iron ) showing the differences in atomic arrangement. At a certain temperature, ( usually between and ), the base metal of steel ( iron ) undergoes a change in the arrangement of the atoms in its crystal matrix, called allotropy.
At its peak, the Apollo program employed 400, 000 people and required the support of over 20, 000 industrial firms and universities.
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