earth15 小时
Was early Earth a purple planet? Scientists say it's possible
New research suggests Earth was once a purple planet. Early microbes used retinal, not chlorophyll, for photosynthesis.
The Red Planet: Mars is actually many colors. At the surface, we see colors such as brown ...
From its peculiar reddish colour, to whether life ever existed on Mars, NASA has unlocked several secrets of the red planet over the decades. Check out these 7 stunning NASA images of Mars that reveal ...
Space.com23 天
Blue Ghost moon lander sees Earth as a 'blue marble' from orbit (photo)
"Our GhostRiders captured the beauty of our home planet during another Earth orbit burn." Firefly Aerospace's Blue Ghost moon lander caught haunting images of Earth while preparing to make its way ...