heart murmur a sound additional to the normal heart sounds, heard on auscultation of the heart. Many murmurs are of no significance (innocent, physiological murmurs), particularly in young children, or due to increased blood flow through the heart during exercise, or in pregnancy.
Columbia Space Shuttle Disaster. On February 1, 2003, the space shuttle Columbia was returning from its 28th mission when, 16 minutes to touchdown, the shuttle incinerated and broke apart over Texas. Communication between the Columbia crew and Mission Control captures the last moments of the flight.
Space & Cosmos. The Challenger Space Shuttle Disaster, 30 Years Later. On Jan. 28, 1986, at 11:39 a.m., people across the country watched in horror as the space shuttle Challenger exploded over the Atlantic Ocean, killing everyone on board. It remains one of the worst accidents of the American space program. 1  Photo The space shuttle Challenger exploded shortly after lifting off. Credit Bruce Weaver/Associated Press âObviously a Major Malfunctionâ. 2  Photo The disaster was the first in which United States astronauts died in flight.