moon
Webster Dictionary
the celestial orb which revolves round the earth; the satellite of the earth; a secondary planet, whose light, borrowed from the sun, is reflected to the earth, and serves to dispel the darkness of night. The diameter of the moon is 2,160 miles, its mean distance from the earth is 240,000 miles, and its mass is one eightieth that of the earth. See Lunar month, under Month
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mine
Webster Dictionary
to dig a mine or pit in the earth; to get ore, metals, coal, or precious stones, out of the earth; to dig in the earth for minerals; to dig a passage or cavity under anything in order to overthrow it by explosives or otherwise
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obliquity
(əˈblɪk wɪ ti, oʊˈblɪk-)
Random House Webster's College Dictionary
the angle between the plane of the earth.. orbit and that of the earth.. equator, equal to 23°27′; the inclination of the earth.. equator.
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geostationary
(ˌdʒi oʊˈsteɪ ʃəˌnɛr i)
Random House Webster's College Dictionary
of, pertaining to, or designating a satellite traveling in an orbit 22,300 mi. (35,900 km) above the earth.. equator, at which the satellite's period of rotation matches the earth.. and the satellite always remains in the same spot over the earth; geosynchronous.
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mountain
Webster Dictionary
a large mass of earth and rock, rising above the common level of the earth or adjacent land; earth and rock forming an isolated peak or a ridge; an eminence higher than a hill; a mount
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astrobiology
(ˌæs troʊ baɪˈɒl ə dʒi)
Random House Webster's College Dictionary
the science that studies the origin and evolution of life in the universe, the effects of extraterrestrial conditions on living organisms from Earth, the potential existence of life beyond the earth.. atmosphere, and the prospects for the future of life on Earth and beyond. Compare exobiology.
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geodesy
Webster Dictionary
that branch of applied mathematics which determines, by means of observations and measurements, the figures and areas of large portions of the earth.. surface, or the general figure and dimenshions of the earth; or that branch of surveying in which the curvature of the earth is taken into account, as in the surveys of States, or of long lines of coast
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spacecraft
(ˈspeɪsˌkræft, -ˌkrɑft)
Random House Webster's College Dictionary
a vehicle designed for travel or operation in space beyond the earth.. atmosphere or in orbit around the earth.
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meridian
(əˈrɪd i ən)
Random House Webster's College Dictionary
a great circle of the earth passing through the poles and any given point on the earth.. surface.
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reentry
(ˈɛn tri)
Random House Webster's College Dictionary
the return from outer space into the earth.. atmosphere of an earth-orbiting satellite, spacecraft, rocket, or the like.
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coriolis effect
(ˌkɔr iˈoʊ lɪs)
Random House Webster's College Dictionary
the deflection of a body in motion with respect to the earth as seen by an observer on the earth, attributed to a hypothetical force
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ionosphere
(ɪˈɒn əˌsfɪər)
Random House Webster's College Dictionary
the region of the earth.. atmosphere between the stratosphere and the exosphere, consisting of several ionized layers and extending from about 50 to 250 mi. (80 to 400 km) above the surface of the earth.
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north pole
(ˈnɔrθˌmoʊst)
Random House Webster's College Dictionary
the end of the earth.. axis of rotation, marking the northernmost point on earth.
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magnetosphere
(ægˈni təˌsfɪər)
Random House Webster's College Dictionary
the outer region of the earth.. ionosphere where the earth.. magnetic field controls the motion of charged particles, as in the Van Allen belts.
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equinox
(ˈi kwəˌnɒks, ˈɛk wə-)
Random House Webster's College Dictionary
the time when the sun crosses the plane of the earth.. equator, making night and day of approximately equal length all over the earth and occurring about March 21
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magnetopause
(ægˈni təˌpɔz)
Random House Webster's College Dictionary
the boundary between the earth.. magnetosphere and interplanetary space, ab. 40,000 mi. (65,000 km) above the earth.
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south pole
(ˈsaʊθˌpɔ)
Random House Webster's College Dictionary
the southern end of the earth.. axis, the southernmost point on earth.
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precession
(ˈsɛʃ ən)
Random House Webster's College Dictionary
the slow, conical motion of the earth.. axis of rotation caused by forces exerted on the earth by the sun and moon and responsible for the precession of the equinoxes.
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precambrian
(ˈkæm bri ən, -ˈkeɪm-)
Random House Webster's College Dictionary
noting or pertaining to the earliest era of earth history, ending 570 million years ago, during which the earth.. crust formed and life first appeared in the seas.
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pole
(pole)
Princeton's WordNet
one of two antipodal points where the earth.. axis of rotation intersects the earth.. surface
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geocentric parallax
(geocentric parallax, diurnal parallax)
Princeton's WordNet
the parallax of a celestial body using two points on the surface of the earth as the earth rotates
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diurnal parallax
(geocentric parallax, diurnal parallax)
Princeton's WordNet
the parallax of a celestial body using two points on the surface of the earth as the earth rotates
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van allen belt
(Van Allen belt)
Princeton's WordNet
a belt of charged particles (resulting from cosmic rays) above the Earth trapped by the earth.. magnetic field
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sky wave
(sky wave)
Princeton's WordNet
a radio wave that is reflected back to earth by the ionosphere or a communications satellite; permits transmission around the curve of the earth.. surface
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extraterrestrial object
(extraterrestrial object, estraterrestrial body)
Princeton's WordNet
a natural object existing outside the earth and outside the earth.. atmosphere
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estraterrestrial body
(extraterrestrial object, estraterrestrial body)
Princeton's WordNet
a natural object existing outside the earth and outside the earth.. atmosphere
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eccentric
Webster Dictionary
in the Ptolemaic system, the supposed circular orbit of a planet about the earth, but with the earth not in its center
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ground
Webster Dictionary
a conducting connection with the earth, whereby the earth is made part of an electrical circuit
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kieselguhr
Webster Dictionary
siliceous earth; specifically, porous infusorial earth, used as an absorbent of nitroglycerin in the manufacture of dynamite
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subterraneous
Webster Dictionary
being or lying under the surface of the earth; situated within the earth, or under ground; as, subterranean springs; a subterraneous passage
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