The universe tells us its story mainly through light and other wavelengths of electromagnetic radiation. We learn about the planets, stars, and galaxies by their light—visible light, and also ...

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 ...

This dim, cone-shaped glow points nearly straight up from the horizon and is caused by sunlight reflecting off copious cosmic dust in the solar system. Hi folks, tune in every week of 2023 for the ...

The telescope 'time machine' will deliver 13.5 billion years of cosmic history. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The newest deep ...

Outdoor lighting for buildings, roads and advertising can help people see in the dark of night, but many astronomers are growing increasingly concerned that these lights could be blinding us to the ...

This story is part of the Grist series Coming to our Senses, a weeklong exploration of how climate change is reshaping the way we see, hear, smell, touch, and taste the world around us. The beginning ...

The CTIO 4-meter Blanco telescope, silhouetted against the Magellanic Clouds (at left) and the Milky Way, as seen from Cerro Tololo in Chile. Artificial light pollution here on Earth poses more of a ...

Over the weekend, astronomers and space enthusiasts everywhere caught a glimpse of SpaceX’s recently launched Starlink satellites in the sky. They’re the first 60 spacecraft of nearly 12,000 the ...

Images captured by NASA's Parker Solar Probe as the spacecraft made its record-breaking closest approach to the sun in December 2024 have now revealed new details about how solar magnetic fields ...

A gamma-ray burst (GRB) — the most energetic type of explosion in the universe since the Big Bang — is detected once every day, on average. But what happened on July 2, 2025, was highly unusual: ...