To date, close to 30,000 satellites have been launched into Earth’s orbit, leading to mounting concerns over the debris created when they collide. In a new analysis posted to the preprint server arXiv, Hugh Lewis of the University of Birmingham shows that satellite constellations can grow so large that they cross a critical size beyond […]

More than 70% of massive stars are born in close binary systems, where gravitational tugs and mass transfer between companions dramatically alter their evolution. Yet once the interaction ends—whether through mass transfer, merger or the supernova explosion of one partner—the surviving star often appears as a solitary object, hiding its turbulent past. For decades, astronomers […]

For more than two decades, the quasar PHL 1811 has been considered the prototype of a rare class of “intrinsically X-ray weak” quasars, thought to produce unusually little X-ray radiation. But in 2024, the Einstein Probe spacecraft caught the object in a bright X-ray flare. In a new study, astronomers combined that observation with more […]

Little red dots have puzzled astronomers since their discovery in James Webb Space Telescope (JWST) data from the universe’s deep past. Their “powering engines” might resemble a newly discovered phenomenon dubbed a “black hole star”—an early, rapidly growing black hole wrapped in dense gas. This object, described in a study published today in Nature by […]

The surface of the moon is a bleak and forbidding place that could be hiding a lot of water ice within its dusty landscape. However, most possible ice deposits don’t just stand out in an image. Scientists need specialized mapping to find those deposits, so they have devised another way to find the moon’s frosty […]

In extreme environments, habitats are built for survival. Submarines, Antarctic bases and post-disaster dwellings are designed to prioritize health and safety. This is especially the case for habitats in space, where room is limited, contact with Earth is remote and hazards are numerous.

Go to Source

The habitable zone concept is useful for understanding which worlds might, possibly, maybe, be habitable. It highlights exoplanets at the right distances from their stars for liquid water to potentially exist on their surfaces. But that alone can’t determine habitability.

Go to Source

University of Missouri researchers have uncovered evidence that challenges one of astronomy’s most trusted assumptions, a breakthrough that could reshape how scientists measure galaxies and reconstruct the history of the universe.

Go to Source