Albert Einstein's handwritten notes for the theory of relativity are being auctioned in Paris on Tuesday, expected to fetch millions of euros. 

Scientists have been able to get a rare glimpse into a crucial, early stage of human development by analyzing an embryo in its third week after fertilization — a moment in time that has been difficult to study because of both practical and ethical considerations.

European researchers looked at a single embryo that was 16 to 19 days old, donated by a woman who ended her pregnancy. Until now, experts said, researchers have lacked a full understanding of this stage of development because human embryos at this stage are difficult to obtain. Most women don't yet know they're pregnant by this point and decades-old global guidelines have until recently prohibited growing human embryos in a lab beyond 14 days.

Russia's defense ministry on Tuesday admitted to destroying one of its satellites during a missile test but rejected U.S. accusations that it had endangered the International Space Station. 

U.S. officials on Monday accused Russia of a "dangerous and irresponsible" strike on a satellite that had created a cloud of debris and forced the ISS crew to take evasive action.

Wang Yaping has become the first Chinese woman to conduct a spacewalk as part of a six-month mission to the country's space station.

Wang and fellow astronaut Zhai Zhigang left the station's main module on Sunday evening, spending more than six hours outside installing equipment and carrying out tests alongside the station's robotic service arm, according to the China Manned Space agency.

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France has successfully launched a state-of-the-art satellite into orbit, designed to allow all of France's armed forces across the globe to communicate swiftly and securely. 

A hefty set of tusks is usually an advantage for elephants, allowing them to dig for water, strip bark for food and joust with other elephants. But during episodes of intense ivory poaching, those big incisors become a liability.

Now researchers have pinpointed how years of civil war and poaching in Mozambique have led to a greater proportion of elephants that will never develop tusks.

Iran on Thursday awarded a prestigious prize in the study of science and technology to two physicists based in the United States.

Harvard University physics professor Cumrun Vafa received The Mustafa Prize in the field of "All Areas of Science and Technology." Vafa is an Iranian-American.

Scientists attempting to bring back the near-extinct northern white rhinoceros announced Thursday they would stop harvesting eggs from one of two remaining live specimens involved in an unprecedented breeding program.

South Korea launched its first domestically-developed space rocket on Thursday, carrying a 1.5-tonne payload as it seeks to join the ranks of advanced space-faring nations.