expression, noun
dust tail (of a comet)
Technical term in astronomy for the curved, yellowish tail of a comet composed of dust particles.
彗星の塵の尾は、太陽の光を反射して輝く。
A comet's dust tail shines by reflecting sunlight.
塵の尾はイオンの尾よりも曲がっている。
The dust tail is more curved than the ion tail.
イオンの尾 (ion tail) is the straight, bluish tail of a comet made of ionized gas, while 塵の尾 is the curved, yellowish dust tail.
Compound of 塵 (ちり, 'dust') + の (possessive particle) + 尾 (お, 'tail'). Literally 'tail of dust'.