Science News Roundup: Could key ingredients for life have arrived from space? Scientists say yes; SpaceX set to launch the space station's next astronaut crew for NASA and more

The SpaceX launch vehicle, consisting of a two-stage Falcon 9 rocket topped with a Crew Dragon capsule dubbed Freedom, was set for liftoff with its four-member crew at 3:52 a.m. EDT (0752 GMT) from NASA's Kennedy Space Center in Cape Canaveral, Florida. Inmarsat chief warns of potentially hazardous satellite boom British satellite company Inmarsat warned on Tuesday of dangerous levels of space debris from satellite constellations planned by Elon Musk's Starlink, Amazon, Chinese operators and others.

Following is a summary of current science news briefs.

Could key ingredients for life have arrived from space? Scientists say yes

A fresh examination of meteorites that landed in the United States, Canada, and Australia is bolstering the notion that such objects may have been delivered to Earth early in its history with chemical ingredients vital for the advent of life. Scientists previously had detected on these meteorites three of the five chemical components needed to form DNA, the molecule that carries genetic instructions in living organisms, and RNA, the molecule crucial for controlling the actions of genes. Researchers said on Tuesday they have now identified the final two after fine-tuning the way they analyzed the meteorites.

SpaceX set to launch the space station's next astronaut crew for NASA

Elon Musk's rocket company SpaceX was due to launch the next long-duration astronaut crew to the International Space Station (ISS) for NASA early on Wednesday, including a medical doctor turned spacewalker and a geologist specializing in Martian landslides. The SpaceX launch vehicle, consisting of a two-stage Falcon 9 rocket topped with a Crew Dragon capsule dubbed Freedom, was set for liftoff with its four-member crew at 3:52 a.m. EDT (0752 GMT) from NASA's Kennedy Space Center in Cape Canaveral, Florida.

Inmarsat chief warns of a potentially hazardous satellite boom

British satellite company Inmarsat warned on Tuesday of dangerous levels of space debris from satellite constellations planned by Elon Musk's Starlink, Amazon, Chinese operators, and others. Inmarsat Chief Executive Rajeev Suri welcomed innovation in satellite constellations in low orbit but added that there should be better industry and regulatory coordination as they are launched.

All-private astronaut team returns safely from landmark space station visit

The first all-private astronaut team ever flown aboard the International Space Station (ISS) safely splashed down in the Atlantic off Florida's coast on Monday, concluding a two-week science mission hailed as a landmark in commercialized human spaceflight. The SpaceX crew capsule carrying the four-man team, led by a retired NASA astronaut who is now vice president of the Texas company behind the mission, Axiom Space, parachuted into the sea after a 16-hour descent from orbit.

(With inputs from agencies.)