土星能浮在水面上？

Saturn is a very big planet. 土星是一颗特别大的行星。 But it is very light for its size. 可它个头大，身子却很轻。 It is even lighter than water. 它比水还要轻呢。 If we had a huge pool, Saturn could float. 要是有个超大的水池，土星能漂起来。 It would float like a ball on the water. 它会像个大球一样浮在水面上。 That is because it is made mostly of gas. 因为它大部分都是气体呀。 No other big planet can do that. 别的大行星，可做不到这一点。