Loud and clear: Curiosity and Perseverance are both back in touch with Earth following solar conjunction. They’re beginning to downlink data collected while the Sun was blocking the signal path between us and the Red Planet.

Keep up with the latest at science.nasa.gov/mars/

The phrase “House of Cards” is often associated today with a Netflix political drama, but its original meaning refers to a structure that is inherently unstable. That idea is exactly how Sarah Thiele, who began this work as a PhD student at the University of British Columbia and is now at Princeton, and her co-authors describe today’s satellite mega constellation system in a new study released as a preprint on arXiv.

Their choice of words is supported by the numbers. Across all Low-Earth Orbit mega constellations, calculations show that a “close approach”, defined as two satellites passing within less than 1 kilometer of each other, happens about once every 22 seconds. For Starlink alone, such encounters occur roughly every 11 minutes. In addition, each of Starlink’s thousands of satellites must carry out an average of 41 maneuvers each year to avoid collisions with other objects in orbit.

At first glance, this may look like a carefully managed system functioning as intended. But engineers know that “edge cases”, events that fall outside normal operating conditions, are often what trigger major failures. According to the paper, solar storms represent one such edge case for satellite mega constellations. Under typical conditions, solar storms disrupt satellite operations in two main ways.

Days away from irreversible collisions
According to their calculations, as of June 2025, if satellite operators were to lose their ability to send commands for avoidance maneuvers, there would be a catastrophic collision in around 2.8 days. Compare that to the 121 days that they calculated would have been the case in 2018, before the megaconstellation era, and you can see why they are concerned. Perhaps even more disturbingly, if operators lose control for even just 24 hours, there’s a 30% chance of a catastrophic collision that could act as the seed case for the decades-long process of Kessler syndrome.

Tomorrow marks 40 years since Voyager 2 made its closest approach to Uranus. It remains humanity's first and only spacecraft to have flown by the 7th planet from our Sun.

Voyager 2 discovered 10 moons, and examined Uranus's ring system, discovering two new rings.

For every US$1 the world invests in protecting nature, it spends US$30 on destroying it. This stark imbalance is the central finding of a new UN Environment Program (UNEP) report released today. It calls for a major shift in global financing of nature-based solutions and phasing out harmful investments to deliver high returns, reduce risk exposure, and enhance resilience.

"If you follow the money, you see the size of the challenge ahead of us. We can either invest into nature's destruction or power its recovery—there is no middle ground," said Inger Andersen, Executive Director of UNEP. "While financing nature-based solutions crawls forward, harmful investments and subsidies are surging ahead. This report offers leaders a clear roadmap to reverse this trend and work with nature, rather than against it."

Researchers have moved a step closer to new treatments for a rare and often devastating autoimmune disease that interferes with how the brain communicates.

The study highlights a vulnerable point in the disease process, one that could eventually be used to design more precise therapies. The condition develops when the immune system mistakenly targets the NMDA receptor, a protein essential for learning, memory, and normal brain signaling. By identifying where this attack occurs, the work also opens the possibility of a future blood test that could flag the disease earlier, when current treatments may be more effective.

The disorder gained public attention through the bestselling memoir and the 2016 film “Brain on Fire,” but it remains uncommon. Each year, it affects an estimated 1 in a million people, most frequently young adults in their 20s and 30s. Despite its rarity, the illness can progress rapidly and cause life-threatening neurological symptoms.

In people with the condition, the immune system produces anti-NMDA receptor autoantibodies that attach to NMDA receptors in the brain and disrupt their function. This immune-driven damage can lead to dramatic changes in behavior and cognition, severe memory loss, seizures, and, in some cases, death.

Pinpointing a Molecular Targetz
In the new study, scientists focused on identifying exactly where these harmful antibodies bind. They discovered specific regions on a subunit of the NMDA receptor that appear to be central to the disease process. Blocking these regions, the researchers suggest, could help stop or even reverse the progression of symptoms.

First identified in the early 1800s, the Helix Nebula is one of the most recognizable planetary nebulas in the night sky, known for its dramatic ring-like appearance. Because it is one of the closest planetary nebulas to Earth, astronomers have long used both ground-based and space-based telescopes to study it as a detailed example of how stars end their lives.

Those observations have now reached a new level with the James Webb Space Telescope, which has delivered the clearest infrared view yet of this well-known object.

A Glimpse of the Sun’s Distant Future
Webb’s powerful instruments allow scientists to zoom in on the Helix Nebula and examine what could one day happen to our own Sun and planetary system. The telescope’s high-resolution data brings the structure of gas streaming away from the dying star into sharp focus. These observations show how stars return their material to space, providing the ingredients that later form new stars and planets.

Images captured by Webb’s NIRCam (Near-Infrared Camera) reveal striking pillar-shaped features around the inner edge of an expanding shell of gas. These structures resemble comets with long tails pointing away from the central star. They form where intense winds of hot gas collide with cooler layers of dust and gas that were released earlier in the star’s life, carving the nebula into its complex and textured shape.

A new image from NASA’s James Webb Space Telescope of a portion of the Helix Nebula highlights comet-like knots, fierce stellar winds, and layers of gas shed off by a dying star interacting with its surrounding environment. Webb’s image also shows the stark transition between the hottest gas to the coolest gas as the shell expands out from the central white dwarf.