Axios

Some nations are capable of disabling satellites without destroying them, opening up different avenues for how conflicts may play out in space.

The big picture: One of the major concerns about warfare in space is the uncontrollable nature of space junk created from destroying or permanently disabling satellites.

President-elect Joe Biden should anticipate major and minor conflicts in space from even the earliest days of his presidency.

The big picture: President Donald Trump's military and civil space policies are well-documented, but Biden's record and views on space are less clear.

China has landed its robotic Chang'e-5 mission on the lunar surface, according to state-run news service Xinhua.

Why it matters: The spacecraft is expected to collect samples from the Moon that will then be returned to Earth for scientific analysis, marking China's most ambitious Moon mission yet.

Nations around the world are shoring up their defensive and offensive capabilities in space — for today's wars and tomorrow's.

Why it matters: Using space as a warfighting domain opens up new avenues for technologically advanced nations to dominate their enemies. But it can also make those countries more vulnerable to attack in novel ways.

A non-COVID medical breakthrough: People over 60 now have access to a blood test for Alzheimer's disease.

Why it matters: The existing PET brain scan test costs some people about $5,000 and often isn't covered by insurance, AP reports.