Starship Cleared, Black Holes Found, and an 80-Year Physics Problem Solved

The FAA has cleared SpaceX Starship for Flight 13 after completing its mishap investigation, a regulatory milestone that came relatively quickly and suggests the agency found the previous anomaly understood and corrective actions in place. Starship stands 123 meters tall — roughly the height of a 40-story building — and Flight 13 is expected to attempt additional milestones in both upper-stage reentry and the booster catch mechanism SpaceX calls 'Mechazilla.' Once regulatory clearance is in hand, SpaceX typically moves quickly; a launch window announcement within weeks is realistic.

The Hubble Space Telescope has detected the first stellar-mass black hole inside Omega Centauri, the Milky Way's largest globular cluster, which contains roughly ten million stars packed into a sphere about 150 light years across. Stellar-mass black holes — formed when individual massive stars collapse — are far harder to find than the supermassive variety because they are smaller and do not shine. Hubble identified this one by detecting its gravitational influence on nearby stars, a technique requiring extraordinary precision given the cluster's density.

Astronomers have identified the first true sugar in interstellar space: erythrulose, a four-carbon sugar that contributes to the chemical signature of raspberries, detected in a molecular cloud near the center of the Milky Way. The discovery matters for astrobiology because sugars are RNA building blocks, and finding complex organic molecules distributed through the interstellar medium suggests that the chemical precursors to life are far more widely available across the galaxy than previously understood. It does not confirm life elsewhere — but it confirms the ingredients are present.

NYU researchers have resolved the Feynman Sprinkler problem, an experimental puzzle that Richard Feynman posed in the 1940s and that physics textbooks have been hedging on for roughly 80 years. The question — whether a reverse-running sprinkler sucking in water rotates in the opposite direction from normal, stays still, or rotates the same way — was answered by building specially engineered 'silly sprinklers' that isolated the relevant fluid dynamics. The team found the answer depends critically on flow rate: the backward sprinkler rotates in the opposite direction at low flow rates and stagnates at high ones.

Penn State researchers have developed paint-on skin electrodes — conductive inks applied directly to skin that dry into flexible, conformable sensors measuring heart rate, muscle activity, and neural signals. The key advantage over wearable devices is the elimination of motion artifact: the gap between a wearable and the skin surface picks up noise when the body moves, a problem that disappears when the electrode is bonded directly to the skin. A separate theoretical physics proposal connected dark matter to a hidden spatial dimension, suggesting that particles leaking into an extra dimension could produce the gravitational signatures currently attributed to dark matter — a hypothesis the paper frames as falsifiable through precise cosmological observation.