Japan's Hayabusa2 mission dispatched a probe over 180 million miles to an asteroid, collecting surface material that returned to Earth six years after arrival. Analysis of this sample now offers clues about the origins of life on our world. This overview covers those recent results along with other noteworthy science developments from the past week.
Scientists have examined the asteroid Ryugu specimens brought back by Japan's Hayabusa2 probe in 2020, seeking evidence of early solar system environments. This week, a Japanese research group announced a significant find: the presence of five essential components for DNA and RNA. Combined with prior investigations, these results advance our knowledge of how life's raw materials reached Earth eons ago.
Detailed in Nature Astronomy, the research identified the nucleobases adenine, guanine, cytosine, thymine, and uracil. These same compounds appeared in material from asteroid Bennu collected in 2023, as well as in the Murchison and Orgueil meteorites discovered earlier. The study proposes that such nucleobases were common across the primordial solar system, with carbonaceous asteroids like Ryugu and Bennu likely delivering them to our planet. The samples also contained ammonia, potentially involved in nucleobase synthesis.
Toshiki Koga, the lead researcher from the Japan Agency for Marine-Earth Science and Technology, clarified to AFP that this detection 'does not imply life on Ryugu.' Rather, it shows that ancient asteroids could generate and maintain key molecules tied to life's chemical beginnings.
A German research effort uncovered three bacterial species capable of metabolizing a prevalent plastic softener, but only collaboratively. Published in Frontiers in Microbiology, the work describes a bacterial group—comprising two Pseudomonas genus strains and one Microbacterium—that degrades various phthalate esters (PAEs), additives that enhance plastic flexibility. As plastic waste proliferates, these substances pollute ecosystems and pose risks to human and animal health.
The scientists sourced microbes from a lab biofilm on polyurethane bioreactor tubing. They cultured this in a medium where diethyl phthalate (DEP), a PAE, served as the primary carbon and energy source. This yielded a consistent bacterial mix that degraded DEP effectively, provided concentrations stayed below 888 milligrams per liter, per a news release. At 30 degrees Celsius, the group fully consumed DEP within 24 hours and handled other PAEs like dimethyl phthalate, dipropyl phthalate, and dibutyl phthalate.
DNA analysis pinpointed the bacteria, revealing no single strain could process PAEs alone, indicating a mutual 'cross-feeding' mechanism. This bacterial alliance could aid environmental cleanup by targeting PAE-contaminated sites or accelerating plastic breakdown through increased brittleness. The team suggests it might apply to managing industrial plastic residues as well.
Fresh Hubble Space Telescope photos reveal the surprising disintegration of Comet C/2025 K1 (ATLAS), or Comet K1, during its November exit from the solar system. A observing group, originally focused on another comet, pivoted due to equipment problems and fortuitously documented Comet K1's fragmentation. Between November 8 and 10, 2025, Hubble took three 20-second exposures, with the initial one roughly eight days post-onset. In that interval, a minor fragment further subdivided. This timing proved exceptionally fortuitous.
John Noonan, a physics research professor at Auburn University, stated, 'Hubble has never imaged a splitting comet so soon after the event.' Typically, observations occur weeks or a month later, but here it was mere days afterward. Further details on this uncommon observation are available in related reports.
Several U.S. states are challenging the Environmental Protection Agency in court over its decision to step back from regulating greenhouse gas emissions.
Blue Origin is exploring the idea of deploying AI data centers in orbit.