Astronomy

oort cloud

ουσιαστικό

/ˈuːət klˈaʊd/

(Νέφος Ορτ)

Ορτ νέφος

a distant, hypothetical region surrounding the solar system, thought to harbor icy bodies and comets

corona

ουσιαστικό

/kɜ.roʊ.nə/ or /kē.rooo.nē/

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(κορώνα του Ήλιου)

κορώνα

the outer layer of the Sun's atmosphere, observable as a plasma halo during a solar eclipse

ecliptic

ουσιαστικό

/ɪk.lɪp.tɪk/ or /ik.lip.tik/

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(εκλειπτικός δρόμος)

εκλειπτική

the apparent path that the Sun traces in the sky over the course of a year, which is also the plane of the Earth's orbit around the Sun

parallax

ουσιαστικό

/pɛ.rə.læks/ or /pe.rē.lāks/

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(παράλλαξη)

παραλλαξία

the apparent displacement or difference in the apparent position of an object when viewed along two different lines of sight, often used in astronomy to measure the distance of nearby stars

pulsar

ουσιαστικό

/pʊl.sɜr/ or /pool.sēr/

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(περιστροφικός άστρος νετρονίων)

πάλσαρ

a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation from its magnetic poles

astronomical unit

ουσιαστικό

/ɐstɹənˈɑːmɪkəl jˈuːnɪt/

(μονάδα μέτρησης απόστασης)

αστρονομική μονάδα

a unit of measurement equal to the average distance between the Earth and the Sun, approximately 149.6 million kilometers

parsec

ουσιαστικό

/pɑr.sɛk/ or /paar.sek/

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(παρσεκ (parsek))

παρσέκ (parsek)

a unit of astronomical distance equivalent to about 3.26 light-years

cosmic ray

ουσιαστικό

/kˈɑːzmɪk ɹˈeɪ/

(κοσμικές ακτίνες)

κοσμική ακτίνα

a high-energy particle, mainly originating from outside the Solar System, that travels through space at nearly the speed of light

cosmic microwave background

ουσιαστικό

/kˈɑːzmɪk mˈaɪkɹoʊwˌeɪv bˈækɡɹaʊnd/

(κοσμική μικροκυμματική ακτινοβολία)

κοσμικό μικροκύμα υπόβαθρο

(cosmology) the faint glow of radiation spreading through the universe, believed to be residual radiation from the Big Bang

nebular hypothesis

ουσιαστικό

/nˈɛbjʊlɚ haɪpˈɑːθəsˌɪs/

(νεφώδης θεωρία)

νεφελώδης υπόθεση

(cosmology) a theory proposing that the solar system formed from a rotating nebula of gas and dust about 4.6 billion years ago

Hubble constant

ουσιαστικό

/hˈʌbəl kˈɑːnstənt/

(Σταθερά του Χαμπλ)

Σταθερά Χαμπλ

(cosmology) a measure of the rate at which the universe is expanding, determined from the observation of distant galaxies' recession velocities

interstellar medium

ουσιαστικό

/ˌɪntɚstˈɛlɚ mˈiːdiəm/

(διάμεσος αστρικός χώρος)

διαστρική ύλη

the matter and radiation that exists in the space between stars within a galaxy

heliosphere

ουσιαστικό

/hɛ.lɪɑ:s.fɪr/ or /he.liaas.fir/

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(ηλιακή σφαίρα)

ηλιοσφαιρα

the space surrounding the Sun dominated by solar wind

cosmic dust

ουσιαστικό

/kˈɑːzmɪk dˈʌst/

(διαστημική σκόνη)

κοσμική σκόνη

very small particles originally derived from stars, serving as raw material for forming planets, and existing between galaxies, stars, and other celestial bodies

inflation

ουσιαστικό

/ɪnf.leɪ.ʃən/ or /inf.lei.shēn/

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(εκρηκτική διαστολή)

πληθωρισμός

(cosmology) the rapid expansion of the universe following the Big Bang

magnetic storm

ουσιαστικό

/mæɡnˈɛɾɪk stˈoːɹm/

(γεωμαγνητική καταιγίδα)

μαγνητική καταιγίδα

a disruption in earth's magnetic field caused by solar activity, resulting in variations that can impact electronic systems and communications on earth

aurora australis

ουσιαστικό

/ɐɹˈoːɹə ɔːstɹˈɑːliz/

(νότια αύρα)

νότιος αυγερινός

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

cosmogonic

επίθετο

/kɑ:z.mə.gɑ:.nɪk/ or /kaaz.mē.gaa.nik/

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(κοσμογονικό)

κοσμογονικός

associated with the phenomena, processes, or theories related to the origin and formation of the universe or celestial bodies

extragalactic astronomy

ουσιαστικό

/ˌɛkstɹəɡɐlˈæktɪk ɐstɹˈɑːnəmi/

(Αστρονομία των εξωγαλαξιακών αντικειμένων)

Εξωγαλαξιακή αστρονομία

study of celestial objects outside the Milky Way galaxy

nebular

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/nɛ.bjʊ.lər/ or /ne.byoo.lēr/

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(νέφαλος)

νεφελώδης

relating to or resembling a nebula, which is a cloud of gas and dust in outer space

sidereal

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/saɪd.riəl/ or /said.riēl/

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(αδιανόητος)

αστρικός

relating to the stars or constellations, especially in terms of their positions relative to Earth