SUNSET: 
Satellites and Space Debris Are Polluting Our Night Skies
Astronomers are sounding the alarm about low-Earth orbit satellites and space debris as significant contributors to light pollution that will affect even the remotest earthbound stargazer.
Light Pollution Is Creeping Up on the World's Observatories
Astronomical observatories enjoy some of the world’s darkest night skies. But even there light pollution is spreading, a new study suggests.
What we know about Light Pollution – and What We Don’t
The International Dark-Sky Association’s has summarized more than 300 peer-reviewed studies on the effects of artificial light at night in an effort to help dark-sky advocates.
Tree Rings Help Reconstruct a Millennium of the Sun's Activity
Astronomers are using tree rings as a historical record of solar activity — and they've found that the Sun was much more active in the past.
Astronomers Dim Street Lights to Home in on Light Pollution
Street lights contribute to light pollution, but they are far from the only culprits — and fixing street lights is far from the only solution.
Does Starlink Pose a Space Debris Threat? An Expert Answers
SpaceX's Starlink satellites have come under heavy criticism for their potential to clutter the sky. Here's what a space debris expert has to say about it.
Gaia Maps 1.7 Billion Stars, Widens Cosmic Census
With its second data release, the European Space Agency's Gaia satellite has redefined the way we look at our galaxy.
The Lost LED Revolution: Light Pollution Is Increasing
The transition from sodium lights to LEDs, the so-called “lighting revolution”, was supposed to reduce energy consumption and bring back the starry sky, but new satellite data indicate it’s not working out that way.
Starry Success: Protecting the Night Sky Above La Palma
Ten years ago, La Palma was declared a "Starlight Reserve" and measures were implemented to protect its skies from light pollution. How did they work?
Gaia Mission Maps 1 Billion Stars
The European Space Agency's Gaia mission has released its first data release, mapping a billion stars across the Milky Way and beyond
Rate the Darkness of Your Sky
A new website shows how light pollution spreads around the globe — using data gathered by its users.
Do We Need "Asteroid Day"?
Are we really doing enough to find asteroids, especially the smaller ones that could destroy a city? A private initiative urges a rapid ramp-up of the search effort — but not everyone agrees.
Groundbreaking for Europe's Giant Telescope
The top of Cerro Armazones in Chile yielded on June 19th to a blast that paves the way for the European Extremely Large Telescope.