A source of carbon — a building block of life — is found on Jupiter's moon Europa "The discovery signals a potentially habitable environment in the ocean of Europa," according to the Webb Space Telescope's website. Bill Chappell
NASA effort to bring home asteroid rocks will end this weekend in triumph or a crash NASA's first effort to retrieve samples from an asteroid will send a capsule that contains extraterrestrial pebbles and dust plunging towards a Utah desert on Sunday. Nell Greenfieldboyce
Why people are skeptical of green initiatives — like water-saving washing machines A laundromat owner in Aurora, Colo., installed washing machines that conserve water. His customers abandoned him, but he was able to win them back after learning why they might be skeptical. Rachel Estabrook
New NASA report lays out roadmap for studying UFOs NASA is releasing a new report from advisers on what it would take for the agency to study unidentified anomalous phenomena (also known as UFOs) scientifically. Nell Greenfieldboyce
Australia weighs cat curfews and neutering requirements to rein in feral felines Tanya Plibersek, Australia's Minister for the Environment and Water, declared "war" on feral cats officials say harm other species and carry disease. Critics say the feline threat is overblown. Joe Hernandez
How to see a newly-discovered green comet this week, before it vanishes for 400 years A newly-discovered green comet is zipping by Earth and is now visible for the first time since before Galileo invented his telescope. Linah Mohammad
An Arab astronaut made history in space. Now his country has its sights on Mars The United Arab Emirates celebrated after Emirati astronaut Sultan Alneyadi splashed down to Earth following six months in space, a milestone for its growing space program. Aya Batrawy
Archeologists in Norway found an arrow that was likely trapped in ice for 4,000 years The arrow was found at a site on Mount Lauvhøe that was previously covered in ice. The new discovery adds new "time depth" to the research site. Dustin Jones
Archaeologists in Turkey have identified massive structures below a Roman-era castle The multistory, below-ground structures in Diyarbakir — ID'ed by using ground-penetrating radar — may have sheltered some 10,000 people during wartime many centuries ago, archaeologists believe. Peter Kenyon
Scientists look at the progress made toward understanding — and treating — long COVID Scientists gathered this week to unpack what we know about the underlying cause of long COVID and potential treatments. For many of the researchers here, it's the first time major gathering Will Stone
