不ふ規き則そく銀ぎん河が

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Meanings

irregular galaxy

Astronomical term for a galaxy without a distinct regular shape, such as a spiral or elliptical galaxy.

銀ぎん河が
銀河 is the general term for 'galaxy', while 不規則銀河 specifies a type of galaxy with an irregular shape.
渦うず巻まき銀ぎん河が
渦巻銀河 is a 'spiral galaxy', which has a distinct spiral structure, unlike an irregular galaxy.
楕だ円えん銀ぎん河が
楕円銀河 is an 'elliptical galaxy', which has an elliptical shape, contrasting with the irregular shape of 不規則銀河.

Compound of 不規則 (fukisoku, 'irregular') and 銀河 (ginga, 'galaxy'). The term is a direct translation of the English 'irregular galaxy'.