A Nine-Billion-Year Comet, Solid-Tumor CAR-T, and the AI Actress Taking a Lead Role
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A new study finds that interstellar comet 3I/ATLAS is approximately twice the age of our solar system — roughly nine billion years old, formed when the universe was about four-point-seven billion years old. Our solar system is approximately four-point-six billion years old, meaning 3I/ATLAS has been traveling through interstellar space for longer than Earth has existed. Its composition offers a window into stellar chemistry from an era otherwise accessible only through spectroscopy of distant stars.
China's Tianwen-2 mission reached its target asteroid after a journey of over a billion kilometers — a validation of China's deep space navigation capabilities and the country's second successful interplanetary mission following Tianwen-1's deployment of the Zhurong rover on Mars in 2021. The mission profile is technically demanding: Tianwen-2 will study the near-Earth asteroid before continuing to a main-belt comet, a dual-target design requiring precise trajectory management across an extended mission.
A Nature Communications study challenged a foundational narrative about human evolution: analysis of skull measurements across the fossil record found that the expansion of the human braincase over the past two million years shows statistical signatures more consistent with random genetic drift and evolutionary stasis than with continuous directional natural selection. The implication is that large human brains may not have evolved because intelligence was constantly being selected for — there may have been extended periods where brain size drifted upward by chance without a clear adaptive advantage being tested at each step.
A Shanghai cancer center began treating its first non-Chinese patient with Satri-cel, described as the world's first CAR-T therapy to receive regulatory approval for solid tumors. CAR-T has been used successfully in blood cancers for roughly a decade, but solid tumors have resisted the approach because their microenvironments destroy modified T-cells before treatment can take effect. If Satri-cel's effectiveness extends to non-Chinese patient populations, the implications for cancers including pancreatic, lung, and colorectal could be profound.
On the cultural frontier, an AI actress named Tilly Norwood is set to lead what is being billed as the first feature film with an AI-generated lead performance — not an AI-written screenplay or AI-assisted effects, but a photorealistic AI character in the protagonist role of a narrative feature. The Screen Actors Guild has been in ongoing disputes with major studios over AI likeness rights for two years; this production will test both the legal environment and whether audiences form emotional connections with a lead they consciously know is not human. The 126-year-old National Historic Landmark sailing vessel Victory Chimes sank in Brooklyn harbor during the 250th anniversary celebrations. And the WNBA, in the middle of a breakout moment for viewership and cultural attention, faces a deepening officiating crisis, with coaches and general managers going public with frustrations that threaten to become the dominant storyline heading into the playoff push.