WASHINGTON — A Chinese test of a hypersonic missile designed to evade American nuclear defenses was “very close” to a “Sputnik moment” for the United States, Gen. Mark A. Milley, the chairman of the Joint Chiefs of Staff, said on Wednesday,...

But the Senate Intelligence Committee chair insisted lawmakers are “absolutely on top of this.”

LA city officials have extended the deadline for city workers to get vaccinated to December 18 but until then unvaccinated workers will be forced to pay $130 a week for COVID tests.

Novavax Inc. filed for authorization of its vaccine in the U.K., and Merck & Co. reached a licensing agreement aimed at widening access to its promising pill treatment. Health advocates hope the pact will spur other pharmaceutical companies to act.

A new study claims to have detected evidence of a planet outside our home galaxy. Not everyone is convinced.