51.   To discover if life exists would require going to Mars and digging beneath the iceberg.

52.   Water is considered an indispensable ingredient of life, and its presence on Mars is of increasing interest to scientists who suspect that life once existed on the planet.

53.   Without water, scientists believe, life cannot exist.

54.   But they stopped short of saying that their evidence proves life existed on Mars.

55.   If water ever existed there, that could mean life existed on Mars, too.

56.   In any case, the latest study shows that life can exist inside a salt crystal.

57.   In light of the findings, researchers said the question should no longer be whether extreme life exists on Mars and elsewhere.

58.   It also will seek out frozen deposits of water that might help determine whether life ever existed on the Red Planet.

59.   It also will seek out frozen deposits of water that might help determine if life ever existed on the Red Planet.

60.   Meteorite may mean life existed on Mars.