• Question: Why some nights the sky has more stars than the other?

    Asked by whiteheb to Arttu, Ceri on 24 Jun 2011.
    • Photo: Arttu Rajantie

      Arttu Rajantie answered on 24 Jun 2011:

      Moonlight is so bright that it makes it hard to see the faintest stars, so when it is full moon, you see fewer stars. Similarly if there are more bright lights on the ground, you cannot see the stars as well. There could also be a thin cloud cover, which you cannot see but which blocks some of the starlight, so you cannot see the faintest stars.