A water creature could live until the of the Earth. The tiny water bear looks like an eight-legged . It is one-tenth of a millimeter and has a very tough . It can survive without food for
, and exist in bitterly
and boiling temperatures. Water bears can also survive the of deep oceans, the vacuum of space, nuclear war, global warming, or any other extreme that would kill humans.
Scientists say water bears are so that only the Sun boiling all the Earth's would kill them. This will happen in several years. A study says life is very difficult to destroy and could exist on other . It says that water bears are so tough, it is
for other tough creatures to be in the Universe. It said there was, "a real
for looking for on Mars and in other of the Solar System".