Two months after the breakthrough launch and vertical landing of a reusable rocket, the space firm created by Internet entrepreneur Jeff Bezos did it again.

The company, Blue Origin, said Saturday that the same New Shepard booster which blasted off and landed in November had repeated the feat, hitting an altitude of 333,000 feet (101 kilometers) before "gently" returning to Earth.

The world must act quickly to avert a future in which autonomous robots with artificial intelligence roam the battlefields killing humans, scientists and arms experts warned at an elite gathering in the Swiss Alps.

Rules must be agreed to prevent the development of such weapons, they said at a January 19-23 meeting of billionaires, scientists and political leaders in the snow-covered ski resort of Davos.

Nearly 1,200 rhinos were killed by poachers in South Africa last year, officials said Thursday, a slight decrease on 2014, but another year of carnage fueled by Asian-led demand for their horn.

"By the end of December 2015, the number of poached rhinos was 1,175," Environmental Affairs Minister Edna Molewa told reporters.

A tiger attacked a keeper at a zoo in Australia on Thursday, leaving him with a "significant puncture wound" to the head at the popular tourist attraction, officials said.

The man in his 40s was treated by paramedics at the Sunshine Coast's Australia Zoo, founded by the family of late "Crocodile Hunter" star Steve Irwin, for wounds to his forehead and wrist and scratches to his body, a Queensland state ambulance spokesman said.

Inside a travelling aquatic circus in Kyrgyzstan's capital Bishkek, whoops and cheers go up as a dolphin leaps out of a pool and slam-dunks a ball through a basketball net.

Hundreds of people packed inside the Moscow Travelling Dolphinarium to watch dolphins and beluga whales perform acrobatic stunts, against a painted backdrop of blue skies and palm trees.

A previously unknown giant planet, nicknamed Planet Nine, may have been discovered lurking in the outer reaches of our solar system, U.S. scientists announced on Wednesday.

The object "has a mass about 10 times that of Earth" and follows a "bizarre, highly elongated orbit in the distant solar system," said a statement by researchers at the California Institute of Technology (Caltech).

A bright orange zinnia has blossomed aboard the International Space Station, marking a first in space.

"First flower even grown in space makes its debut," U.S. astronaut Scott Kelly wrote on Twitter, with a photo of the flower.

Pushed from their forest home by encroaching farm land, wild elephants are driving fearful villagers in a Myanmar township to seek refuge in tree houses while the animals storm their rice paddies looking for food.

The elephants have trampled crops, destroyed homes and even, villagers say, killed people in their path -- forcing families in Kyat Chuang to build new shelters made of wood and bamboo on higher ground.

Part of a joint European-Russian mission to search for signs of life on Mars may be delayed due to cash flow problems, the European Space Agency said Friday.

"We need some more money," ESA director general Jan Woerner told journalists in Paris, citing project cost increases.

The European Space Agency's new boss elaborated Friday on his vision for a multinational research village on the Moon -- a leading contender for a project to succeed the International Space Station.

For now, it is just an idea -- called "crazy" by some -- but one that Jan Woerner said was being widely discussed as the end of the ISS looms large.