time bomb

"Pieces of space junk are like ticking time bombs," observed Moriba Jah, a professor of aerospace engineering at the University of Texas at Austin.

"We are facing a crisis of unemployment - for a population that's 2.4 million when you have almost 30% of those people unemployed, it is a crisis. It’s a ticking time bomb," he said.

"I'm absolutely certain that it's a ticking time bomb," Judith says.

In an interview last month, he had described the southern state of Chiapas as a "time bomb".

In an interview last month, he had described the southern state of Chiapas as "a time bomb".