This paper reviews the important research progresses, major strategic adjustments of the United States, Europe, Russia, and Japan, and newly lunched space science missions in 2019. The contents include the followings. The space-based platform assisted the first direct imaging of a black hole; Hubble found water vapor on habitable-zone ing; Hayabusa 2 touch down asteroid Ryugu for sample retrieval; the Twins Study showed how human body could adapt to a multitude of changes created by spaceflight environment; the United States set the goal of resending astronauts to lunar surface by 2024; Russia divided its lunar program into 4 phases and planed to complete its development path of lunar base by 2024; China successfully launched Taiji-1 gravitational wave detection experimental satellite; and NASA launched ICON to study earth's ionosphere.

space science  /  research front  /  development strategy  /  mission