Dyson spheres, the hypothetical mega-structures that advanced alien civilizations might use to enclose a star and harness its energy, suffer from a fatal flaw: They are catastrophically unstable ...

Dyson spheres, the hypothetical ... Science news this week: A unique new blood type and 'spiderwebs' on Mars. 5. Rocks in Canada may be oldest on Earth, dating back 4.16 billion years.

This year-long project investigated (1) how energy plays a role in competition for influence among the United States, China, and Russia and (2) whether any one country or group of countries could ...