极端海王星外天体的特别之处，一方面在于其轨道的距离跨度极大，呈一个极扁的椭圆形。以塞德娜为例，它的近日点为76 AU，远日点则为约936 ...

Archaeologists have discovered something very interesting about Celtic women. Find out what it is here ...

Could our personalities make us more likely to let our friends down? Find out in this programme ...

We use essential cookies to make our site work. With your consent, we may also use non-essential cookies to improve user experience and analyze website traffic. By clicking “Accept,” you agree to our ...