A giant 'shadow' has been creeping across Mars for 50 years — and scientists aren't sure why
火星乌托邦平原地区的一块暗斑自 1976 年首次被拍摄以来已经显着增长。科学家们对它是什么了解甚少,但他们无法正确解释它的逐渐增长。
Some Smaller Ants Will Clean Bigger Ants and Scientists Aren’t Sure What’s In It for Either of Them
大型收割蚁将允许较小的圆锥蚁梳理和清洁它们,但我们并不完全确定原因。