IELTS Académique (Band 8 et Plus) - Astronomy

a highly energetic celestial object emitting powerful radiation from the center of a galaxy, often associated with a supermassive black hole

quasar

a region beyond Neptune in the solar system containing icy objects like dwarf planets, asteroids, and comets

ceinture de Kuiper

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

nuage d'Oort

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

couronne, corona

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

écliptique

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

parallaxe

an exploding star that as a result is emitting a very large amount of light, more than the sun

supernova

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

pulsar

the lowest layer of Earth's atmosphere, extending from the surface up to an average altitude of about 8-15 kilometers

troposphère

the atmospheric layer above the troposphere, where temperature generally increases with altitude and the ozone layer is situated

stratosphère

the atmospheric layer above the stratosphere, where temperatures decrease with altitude and it extends up to the mesopause

mésosphère

the atmospheric layer above the mesosphere, where temperatures increase with altitude and it extends to the exosphere

thermosphère, couche thermosphérique

a layer in the upper atmosphere containing ions and free electrons, affecting radio communication and contributing to auroras

ionosphère

the outermost layer of Earth's atmosphere, transitioning to outer space, with extremely low gas densities

exosphère

the protective magnetic field region around a celestial body, shielding it from solar wind and charged particles

magnétosphère