In the past few weeks, donations to Zach's cause -- the Children's Cancer Research Fund -- skyrocketed, as did downloads of his song, " Clouds, " which at the time of his death had more than 2.9 million page views on YouTube.
The birth and death phases of stars, for example, are associated with heavy dust clouds that give off an infra-red signal which might resemble the swarm of artificial satellites constituting a Dyson sphere.