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He chased eclipses for five decades, wrote several books about them and worked with NASA to make data accessible to nonscientist sky gazers.

The directive, in a memo issued Tuesday, came after two court rulings that questioned the Trump administration's swift cuts to funding.

Japanese researchers turned to "experimental archaeology" to study how ancient humans navigated powerful ocean currents and migrated offshore.

The way that human adults talk to young children is unique among primates, a new study found. That might be one secret to our species' grasp of language.

In a video address, the health secretary said the United States would no longer donate to Gavi, the vaccine agency. The organization rejected his claims.

The panelists will review measles vaccine recommendations and discuss a preservative that the health secretary has falsely claimed causes autism.

David Keeling would take over the workplace-safety agency just as it is considering rules to protect against extreme heat. His former employers, UPS and Amazon, have opposed the rules.

Hints of a more skeptical approach to immunizations have already surfaced.

The administration has gutted agencies like U.S.A.I.D., and President Trump has denigrated their work as wasteful and rife with fraud. His views on humanitarian assistance have seesawed since he entered political life.

The fourth mission by the company Axiom Space will help the three countries get to the International Space Station for the first time.