STS-114: NASA grounds the Space Shuttle, pending an investigation of the continuing problem with the shedding of foam insulation from the external fuel tank. During ascent, the external tank of the Space Shuttle Discovery sheds a piece of foam slightly smaller than the piece that caused the Space Shuttle Columbia disaster; this foam does not strike the spacecraft.

Spacecraft
Space Shuttle Columbia disaster
Space Shuttle Discovery
Space Shuttle external tank
Space Shuttle
NASA
STS-114