I know Elon Musk and others are working on it, but remembering this tragedy also makes me feel especially sad that the U.S. doesn’t have independent human space flight capability right now.

America remembers Challenger, 30 years on • 2016 Jan 26 • Reuters

The Challenger Space Shuttle Disaster, 30 Years Later • 2016 Jan 28 • Karen Workman • New York Times