Space cannot even properly be said to be expanding because, as the physicist and Nobel laureate Steven Weinberg notes, solar systems and galaxies are not expanding, and space itself is not expanding.

恰当地说，甚至不能说空间在不断膨胀，这是因为，正如诺贝尔奖获得者、物理学家史蒂文·温伯格指出的：太阳系和星系不在膨胀，空间本身也不在膨胀。