Following is a summary of current science news briefs.

Chinese scientists develop gene therapy which could delay ageing

Scientists in Beijing have developed a new gene therapy which can reverse some of the effects of ageing in mice and extend their lifespans, findings which may one day contribute to similar treatment for humans. The method, detailed in a paper in the Science Translational Medicine journal earlier this month, involves inactivating a gene called kat7 which the scientists found to be a key contributor to cellular ageing.

China's retrieved lunar samples weigh less than targeted

Lunar rocks retrieved by a historic Chinese mission to the moon weighed less than initially targeted, but China is still willing to study the samples with foreign scientists, the mission's spokesman said on Monday. China became the third country ever to secure lunar samples when its unmanned Chang'e-5 probe, named after the mythical moon goddess, brought back 1.731 kg (3.8 lb) of samples last month, falling short of the 2 kg (4.4 lb) planned.

Branson's Virgin Orbit reaches space with key mid-air rocket launch

Billionaire Richard Branson's Virgin Orbit reached space for the first time on Sunday with a successful test of its air-launched rocket, delivering ten NASA satellites to orbit and achieving a key milestone after aborting the rocket's first test launch last year. The Long Beach, California-based company's LauncherOne rocket was dropped mid-air from the underside of a modified Boeing 747 nicknamed Cosmic Girl some 35,000 feet over the Pacific at 11:39 a.m. PT before lighting its NewtonThree engine to boost itself out of Earth's atmosphere, demonstrating its first successful trek to space.

(With inputs from agencies.)

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Science News Roundup: Chinese scientists develop gene therapy which could delay ageing; China's retrieved lunar samples weigh less than targeted and...