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aeon

aeon

/ˈiːɑːn/
noun
an endless or lengthy period of time

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perpetual

perpetual

/pɝˈpɛtʃuəɫ/
adjective
continuing uninterrupted that seems to last forever

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spasmodic

spasmodic

/spæzˈmɔdɪk/
adjective
occurring in spells and often abruptly

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solstice

solstice

/ˈsɔɫstɪs/
noun
either of the two times of the year when the sun reaches its farthest or closest distance from the equator

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bicentenary

bicentenary

/baɪˈsɛntɪˌnɛɹi/
noun
the 200th anniversary (or the celebration of it)

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centenary

centenary

/ˈsɛntəˌnɛɹi/
noun
the 100th anniversary (or the celebration of it)

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diurnal

diurnal

/daɪˈɝnəɫ/
adjective
having a daily cycle or occurring every day

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epoch

epoch

/ˈɛpək/, /ˈipək/
noun
a unit of geological time that is a subdivision of a period and is itself divided into ages

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equinox

equinox

/ˈikwəˌnɑks/
noun
either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length

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to elapse

to elapse

/ɪˈɫæps/
verb
(of time) to pass by

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millennial

millennial

/mɪˈɫɛniəɫ/
adjective
marking or denoting a time span of a thousand years

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GMT

GMT

/dʒˌiːˌɛmtˈiː/
noun
the time as measured at Greenwich, London, on the line of 0° longitude, used to calculate the time across the globe

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eventual

eventual

/əˈvɛntʃuəɫ/, /iˈvɛntʃuəɫ/
adjective
happening at the end of a process or a particular period of time

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in due course

in due course

/ɪn dˈuː kˈoːɹs/
adverb
at the appropriate time

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to wane

to wane

/ˈweɪn/
verb
(of the moon) have a progressively less significant part of its seeable surface illuminated so that it seems to reduce in size

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twilight

twilight

/ˈtwaɪˌɫaɪt/
noun
the time in the evening when the sun is below the horizon

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stratospheric

stratospheric

/ˌstɹætəsˈfɪɹɪk/
adjective
*** ‌(specialist) in the layer of the earth's atmosphere between about 10 and 50 kilometres above the surface of the earth

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to wax

to wax

/ˈwæks/
verb
(of the moon) have a progressively more significant part of its seeable surface illuminated so that it seems to increase in size

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space-time

space-time

/ˈspeɪˌstaɪm/
noun
the Theory that adds the notion of time to that of a three-dimensional space

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orbital

orbital

/ˈɔɹbətəɫ/
adjective
of or relating to an orbit

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nebula

nebula

/ˈnɛbjəɫə/
noun
a massive cloud of gas and dust in deep space that often appears very bright and can be seen in the sky at night

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umbra

umbra

/ˈəmbɹə/
noun
a region of complete shadow resulting from total obstruction of light

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meteoroid

meteoroid

/mˈiːɾɪˌoːɹɔɪd/
noun
a small celestial body that becomes visible as a meteor upon entrance into the atmosphere of the earth

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meteorite

meteorite

/ˈmitiɔˌɹaɪt/
noun
a piece of rock or metal from space that has hit the surface of the earth

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meteor

meteor

/ˈmitiɝ/
noun
a piece of rock coming from outer space that passes through the Earth's atmosphere, producing light

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magnetic storm

magnetic storm

/mæɡnˈɛɾɪk stˈoːɹm/
noun
a sudden disturbance of the earth's magnetic field; caused by emission of particles from the sun

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intergalactic

intergalactic

/ˌɪntɚɡɐlˈæktɪk/
adjective
between or among galaxies

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interplanetary

interplanetary

/ˌɪntɝˈpɫænəˌtɛɹi/
adjective
between or among planets

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interstellar

interstellar

/ˌɪntɝˈstɛɫɝ/
adjective
between or among stars

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hyperspace

hyperspace

/ˌhaɪpɝˈspeɪs/
noun
(specialist) space that consists of more than three dimensions

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extraterrestrial

extraterrestrial

/ˌɛkstɹətɝˈɛstɹiəɫ/
adjective
originating or located or occurring outside Earth or its atmosphere

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exoplanet

exoplanet

/ɛɡzˈɑːplɐnˌɛt/
noun
extrasolar planet; a planet that is outside the solar system

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dark matter

dark matter

/dˈɑːɹk mˈæɾɚ/
noun
(physics) material existing in space that reflects no light, based on some theories

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cosmic dust

cosmic dust

/kˈɑːzmɪk dˈʌst/
noun
clouds of particles or gases occurring throughout interstellar space

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corona

corona

/kɝˈoʊnə/
noun
the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse

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comet

comet

/ˈkɑmət/
noun
an object in space that is a mass of ice and dust and when it nears the sun it starts illuminating in the shape of a tail

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aurora australis

aurora australis

/ɐɹˈoːɹə ɔːstɹˈɑːliz/
noun
the colored lights, mainly green and red, in the sky seen primarily near the southern magnetic pole

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aurora borealis

aurora borealis

/ɐɹˈoːɹə bˌoːɹɪˈælɪs/
noun
the colored lights, mainly green and red, in the sky seen primarily near the northern magnetic pole

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constellation

constellation

/ˌkɑnstəˈɫeɪʃən/
noun
a specific group of stars that form a pattern and have a name related to their shape

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biosphere

biosphere

/ˈbaɪoʊsˌfɪɹ/
noun
the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist

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great

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