Our planet, seen from the International Space Station, looks like a Christmas tree. This light, visible from space, is light pollution caused by outdoor lighting that project the light to all directions, diminishing greatly the darkness of the night sky.

Fonte: NASA

Iberian Peninsula at Nigh photographed by an astronaut aboard the International Space Station. Source:

Light pollution is a global problem that we must fight for the following reasons:

  • It is a great waste of energy and money;
  • Contributes to climate change;
  • Affects living beings and in particular human life;
  • Prevents people from seeing the stars and disturb astronomical observations.

The international project Dark Skies Rangers is promoted in Portugal by NUCLIO with the following objectives:

  • Communicate the causes and consequences of light pollution;
  • Raise awareness of the importance of using outdoor lighting that are energy efficient and that direct the light downward;
  • Contribute to the reduction of light pollution and the preservation of the night sky;
  • Promote interest in Astronomy;

In order to achieve these goals, NUCLIO organizes two international contests:



Direção-Geral da Educação
ABAE – Eco-Schools Program
Galileo Teacher Training Program
National Optical Astronomy Observatory