WASHINGTON — A NASA research rocket that had flown successfully 120 consecutive times misfired over the New Mexico desert two weeks ago - the fourth U.S. space launch vehicle to fail this year.
The government, whose space program is under pressure because of the recent explosions of the much larger Titan and Delta rockets and the space shuttle, did not announce the April 25 failure of a Nike Orion rocket carrying a pollution-sampling device.
The accident came to light yesterday as NASA, apparently bowing to a demand by the presidential Challenger commission, announced that it is asking independent experts to oversee the redesign of the solid booster rocket joint that is thought to have caused the space shuttle to explode Jan. 28.



