The Space Doctor on Instagram: "The creator and the destroyer. The Andromeda and Milky Way galaxies are expected to collide in about 4.5 billion years. Surprisingly the sun becomes a red giant in around the same time. So what's a red giant? When a star is about to die it increases in size, our sun will do the same. This happens before the Andromeda collides with our milky way to form Milkromeda. Is it a kind of backstab done by sun? Or something else. #space"

我国天宫空间站正在太空飞行以768km秒的速度绕行地球三名宇航员每天除了工作和休息以外还顺便把中国范带到了外太空 #探索宇宙 #科普 #宇航员 #盒子宇宙