PLANETARY NEBULA


Meaning of PLANETARY NEBULA in English

Composite picture of the Cat's Eye Nebula (NGC 6543), combining three images taken by the any of a class of bright nebulae that may somewhat resemble planets when viewed through a small telescope but are in fact expanding shells of luminous gas far outside the solar system. See nebula.

Britannica English vocabulary.      Английский словарь Британика.