Scientists are sharpening their forecasts for how long Earth can remain a comfortable home for complex organisms, and the latest work points to a much earlier cutoff than the classic textbook ...

From the highest mountains to the deepest oceans, the breath of life as we know it depends on a single, vital element: oxygen. Our planet's atmosphere is currently a vibrant, oxygen-rich blanket, ...

Searching for technosignatures—signs of technology on a planet that we can see from afar—remains a difficult task. There are so many different factors to consider, and we only have the technological ...

A recent SpaceNews opinion article argued that it is time to “take astronomy off Earth.” The suggestion is straightforward: If satellite constellations and commercial space activity threaten ...