(AP) -- Skeptical senators are telling NASA's chief that the space agency lacks a goal and destination.

Earlier this month, the White House killed the previous administration's plan to back to the moon. The space shuttles will soon be retired.

NASA Administrator Charles Bolden says his agency has an ultimate goal: Mars. But he says it's more than a decade away and NASA needs to upgrade its technology before astronauts reach the Red Planet.

Bolden says that on the way to Mars, astronauts will probably stop first at the moon, an asteroid and other places but with no particular order.

Three senators and the agency's former chief astronaut said that without a specific goal, NASA is going nowhere, wasting time and money.