EDITOR’S NOTE: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...

Light pollution can severely impact our access to the stars, raising concerns for future generations. This video explores the extent of light pollution and its effects on astronomy, human health, and ...

This week, Aotearoa New Zealand officially celebrates Matariki for the fourth time, marked by the reappearance in the night sky of the star cluster also known as the Pleiades. Yet, ironically, the ...

For most of human history, darkness was a constant. The rhythms of nature, wildlife behavior, and even human sleep evolved under predictable cycles of day and night. In the past century, however, ...

David L. Crawford, an astronomer and one of the pioneers of the modern dark-sky movement, died peacefully July 22 in Carlsbad, California. During a decadeslong tenure at Kitt Peak National Observatory ...

RICHMOND — Lawmakers unanimously supported a resolution that encouraged Virginians to “ponder the cosmic eons beyond” and consider the impact of increased light pollution. Del. David Reid, D-Loudoun, ...

The morning sun is hidden behind clouds facing the East Foothills during sunrise at the Palo Alto Baylands. Photo by Veronica Weber. For Palo Alto’s conservationists, the adoption of a “dark sky” law ...

ST. LOUIS – The sky is always changing colors—from a bright blue on a clear day, to red and orange sunrises or sunsets, or multiple colors of a rainbow—there’s a lot going on that we don’t always ...

Visible light travels in electromagnetic waves, which we see as the colors of the rainbow. Different colors have different wavelengths of light. Violet and blue have the shortest wavelengths, whereas ...

This week, Aotearoa New Zealand officially celebrates Matariki for the fourth time, marked by the reappearance in the night sky of the star cluster also known as the Pleiades. Yet, ironically, the ...