This week marks a somber time for NASA, with the anniversaries of three U.S. spaceflight disasters recalling the memories of those astronauts who made the ultimate sacrifice in the pursuit of space exploration.
On Friday (Feb. 1), NASA will pause to honor the memories of the three astronauts killed in the Apollo 1 fire of 1967, the seven astronauts killed in the Challenger shuttle disaster in 1986, and the seven astronauts who died when the space shuttle Columbia broke apart during re-entry on Feb. 1, 2003. This year's Day of Remembrance ceremony is especially poignant — it will mark the 10th anniversary of the Columbia disaster that led to the end of the space shuttle program.
More: Disasters (http://www.space.com/19512-nasa-space-disaster-anniversaries.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+spaceheadlines+%28SPACE.com+Headline+Feed%29)
I hadn't realised the dates were so close together :(