| The unpiloted vehicle's supersonic combustion ramjet, or scramjet, ignited as planned and operated for the duration of its hydrogen fuel supply. |
| The gas probably ignited from the heat radiating off the fire or from an electrical spark. |
| Splinters were flung in every direction, some aflame, becoming miniature meteors as they ignited in the dry air. |
| The lowest U.S. peacetime unemployment rate since 1957 has ignited a talent war raging through corporate America. |
| Officials said the fire was caused by an air conditioner short-circuit that ignited bedding and curtains and spread quickly through the prison. |
| The astronomers speculate that quasars were ignited as blackholes grew by swallowing large quantities of cold, dense gas. |
