WASHINGTON (AP) — President Donald Trump’s long-threatened tariffs against Canada and Mexico finally went into effect Tuesday, putting global markets on edge and setting up costly retaliations by the ...

President Donald Trump on Monday directed a “pause” to U.S. assistance to Ukraine after a disastrous Oval Office meeting as Trump seeks to pressure Ukrainian President Volodymyr Zelenskyy to engage in ...

As it nears 35 consecutive years of space service, the NASA/ESA Hubble Space Telescope has taken another look at a famous ...

Simulated stellar explosions show that massive early stars could have created plentiful water for future stars and planets to form from.