For much of human history, the night sky was a shared and familiar presence. In many places, it is becoming harder to see.
Artificial lighting from cities, roads and infrastructure is expanding, creating skyglow that obscures stars and alters natural darkness.
The issue is not only cultural or astronomical. Scientists say excessive night lighting can affect wildlife behaviour, migration patterns and ecosystems.
Human health may also be influenced, as disrupted exposure to natural light cycles can affect sleep and circadian rhythms.
Astronomers warn that light pollution, combined with the growing number of satellites in orbit, is making observation more difficult.
At the same time, solutions are often straightforward: better shielded lighting, lower intensity systems and smarter timing controls.
Some regions have created dark-sky reserves to protect natural night environments and support tourism.
Experts say the disappearance of dark skies is a reminder that environmental loss is not always dramatic or immediate — it can happen gradually, through everyday choices.
