planetary nebula
planetary nebula — noun
1. a large, bright cloud of gas in space that forms when a dying star pushes its ou
a large, bright cloud of gas in space that forms when a dying star pushes its outer layers outward, leaving an extremely hot center that makes the gas shine
The Hubble telescope took a beautiful picture of a planetary nebula shaped like a giant eye.
collocation: take a picture of [planetary nebula]
Astronomers in Tokyo discovered a new planetary nebula in the northern sky last week.
collocation: discover a planetary nebula
When a star like our Sun runs out of fuel, it slowly turns into a planetary nebula.
This planetary nebula looks like a ring of smoke expanding outward into space.
Scientists study planetary nebulae to learn what elements stars create inside them.
文法句型
a planetary nebula
planetary nebulae
用法筆記
Despite the name, a planetary nebula has nothing to do with planets. The term was chosen because these objects look round and greenish through a telescope, similar to how early astronomers saw the planet Uranus.