Distant, ancient galaxies are giving scientists more hints that a mysterious force called dark energy may not be what they thought.

Astronomers know that the universe is being pushed apart at an accelerating rate and they have puzzled for decades over what could possibly be speeding everything up. They theorize that a powerful, constant force is at play, one that fits nicely with the main mathematical model that describes how the universe behaves. But they can't see it and they don't know where it comes from, so they call it dark energy.

A small, bright meteor lit up skies over the northern Philippines early Thursday as it burned up entering the Earth's atmosphere, the European Space Agency and witnesses said.

A spacecraft carrying European and Japanese probes passed closer to Mercury than originally planned overnight after thruster problems delayed the mission to study the little-known, Sun-scorched planet.

South Korea's new space agency said Thursday it was looking to grow its share of the industry and take on Elon Musk's SpaceX, as it unveiled plans to create a "space passageway".

A "mega den" of hundreds of rattlesnakes in Colorado is getting even bigger now that late summer is here and babies are being born.

Thanks to livestream video, scientists studying the den on a craggy hillside in Colorado are learning more about these enigmatic — and often misunderstood — reptiles. They're observing as the youngsters, called pups, slither over and between adult females on lichen-encrusted rocks.

Italian researchers have noted the first case of "virgin birth", or reproduction without fertilization, in an endangered shark species, a scientific journal reported this week.

The findings published in Scientific Reports concern the first case of the phenomenon in the common smooth-hound shark, Mustelus mustelus, a species threatened by illegal fishing that inhabits the Mediterranean and other warm waters.

Japanese scientists have used human cells to develop an equivalent to living skin that can be attached to robotic surfaces to flash a realistic -- if creepy -- smile.

China's space officials said Thursday they welcomed scientists from around the world to apply to study the lunar rock samples that the Chang'e 6 probe brought back to Earth in a historic mission, but noted there were limits to that cooperation, specifically with the United States.

Officials said at a televised news conference in Beijing meant to introduce the mission's achievements that any cooperation with the U.S. would be hinged on removing an American law that bans direct bilateral cooperation with NASA.

China's Chang'e 6 probe returned on Earth with rock and soil samples from the little-explored far side of the moon in a global first.

The probe landed in the Inner Mongolian region in northern China on Tuesday afternoon.

A sonic boom heard in Tuscany and on the French island of Corsica, initially mistaken by holidaymakers, locals and officials for an earthquake, may have been a meteorite, experts said.

The town of Campo nell'Elba, on the Italian tourist island of Elba, said on its Facebook page that a nearby tracking station had "captured a seismic, acoustic event felt by everyone" at 4:30pm (1430gmt).