Add Yahoo as a preferred source to see more of our stories on Google. Ukrainian troops carry rocket-propelled grenades and sniper rifles toward the city of Irpin, northwest of Kyiv, on March ...

Ukrainian forces have turned the tide against Russia despite Moscow's military advantages. Ukraine has benefited from international support and from Russia's failings on the battlefield. Kyiv's ...

Astronomers report the first exoplanet jointly discovered through direct imaging and precision astrometry, a new indirect method that identifies a planet by measuring the position of the star it ...