A rover has been collecting rocks from Mars for years. How will they get back to Earth?
A collection of Martian rocks could reveal details about potential past life on the Red Planet – but first NASA has to get them back to Earth.
来自MSN15 天
Epic 2.5-Billion-Pixel Portrait of Andromeda Galaxy
The Andromeda Galaxy, 2.5 million light-years away, is unveiled in Hubble's largest photomosaic. Spanning a decade, this 2.5-billion-pixel image reveals 200 million stars and Andromeda’s dynamic ...