Breakdown of A imagem da galáxia não está nítida a menos que o céu esteja limpo.
não
not / no
de
of / from / by (means of transport) / wearing (attire)
estar
to be (temporary / location)
limpo
clean
a imagem
the image
o céu
the sky
a menos que
unless
a galáxia
the galaxy
nítido
sharp
Questions & Answers about A imagem da galáxia não está nítida a menos que o céu esteja limpo.
Why do we use esteja in the second half of the sentence but está in the first?
Both are forms of the verb estar (to be). However, the phrase a menos que (unless) always triggers the subjunctive mood because it introduces a condition. So, we must use the present subjunctive esteja for the second part, while the first part states a regular fact using the present indicative está.
Could I use a não ser que instead of a menos que here?
The English translation could use clear for both the image and the sky. Why does Portuguese use two different words (nítida and limpo)?
Portuguese distinguishes between these concepts. Nítida means sharp, focused, or crisp, which applies perfectly to an image or a signal. Limpo literally means clean. When talking about the weather, um céu limpo means a sky clear of clouds or pollution.
Why does the sentence use estar (está / esteja) instead of ser (to be)?
We use estar because both of these are temporary states. The sharpness of the galaxy's image and the cloudiness of the sky can change from minute to minute depending on the weather and the telescope.
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