A supernova is a star exploding — not a small flare, but the star tearing itself apart at the end of its life. For a few weeks it can shine brighter than a whole galaxy, then fade. The plural is supernovae (formal, science writing) or supernovas (both are correct; supernovas is more common in ordinary writing).

A supernova supernova（超新星） is是 a star exploding恆星爆炸 — not a small flare不是小小的閃光, but the star tearing itself apart at the end of its life而是這顆星在生命盡頭把自己徹底炸開。For a few weeks在短短幾個禮拜裡 it can shine brighter than a whole galaxy它可能亮度超過整個星系, then fade然後才逐漸黯淡下來。The plural is複數形是 supernovae (formal, science writing)supernovae（正式的科學寫法） or supernovas或supernovas (both are correct; supernovas is more common in ordinary writing)（兩種都對；一般寫作裡supernovas比較常見）。

This is a real science word, so it keeps its meaning: astronomers, documentaries, textbooks. If you use it, you are talking about a star.

This is這是 a real science word一個真正的科學詞, so所以 it keeps its meaning它的意思很固定: astronomers, documentaries, textbooks天文學家、紀錄片、教科書都這樣用。If you use it如果你用這個字, you are talking about a star講的就是一顆星。

People do borrow it as a picture, though, and the picture is a specific one: brilliant, and then gone. A band that becomes hugely famous and breaks up within a year might be called a supernova. Notice that the image includes the ending — if you only mean "very famous", superstar is the word, not supernova.

People do borrow it as a picture不過大家也會把它借來當作一種比喻, though, and the picture is a specific one而這個比喻很明確: brilliant, and then gone燦爛一時，然後消失。A band that becomes hugely famous and breaks up within a year一個突然爆紅、卻在一年內就解散的樂團 might be called a supernova可能會被說是supernova。Notice that the image includes the ending注意這個意象裡包含了「結束」 — if you only mean 'very famous'如果你只是想說「很有名」, superstar is the word該用的字是superstar, not supernova不是supernova。