Videos showed a bright flash of light, followed by a pop almost like a light bulb burning out.
Mr. Young also walked on the moon and was the only astronaut to fly in the Gemini, Apollo and shuttle programs.
The 19,000-pound Chinese station is expected to plummet to earth in March, but experts say the odds are incredibly low that it will hurt anyone.
An iconic photo of Mr. McCandless floating above Earth captured the imagination of millions. He also played a role in Neil Armstrong’s famed moonwalk.
The shadowy program began in 2007 and was largely funded at the request of Harry Reid, the former Senate majority leader, who has had a longtime interest in space phenomena.
Astronomers have found a planet circling Ross 128, a quiet red star in our own galactic neighborhood.