After more than a month's delay, space shuttle Endeavour and seven astronauts thundered into orbit Wednesday on a flight to the international space st

Space shuttle Endeavour rocketed toward the international space station Thursday as engineers on Earth pored over launch pictures that showed debris breaking off the fuel tank and striking the craft.

Mission Control told the astronauts late Wednesday that the damage looked less extensive at first glance than what occurred on the last shuttle flight, but it will take days to sort through available data to reach a conclusion.

The astronauts planned a Thursday afternoon inspection of their ship's thermal shielding, using a 100-foot laser-tipped boom. The procedure has been standard since shuttle flights resumed after the Columbia accident.

Endeavour's liftoff early Wednesday evening was the sixth try and came more than a month late. It occurred on the eve of the 40th anniversary of the launch of man's first moon landing mission.

"Persistence pays off," launch director Pete Nickolenko told the astronauts, who are carrying up a veranda for Japan's enormous space station lab.

The shuttle had been grounded by hydrogen gas leaks last month and, since the weekend, thunderstorms.