The irony of Julie Mao
Julie Mao knows her father has good intentions when he suggests she moves to Earth's moon for her safety. According to Julie's father, a fatal attack on the Asteroid belt is likely, and many people will die. Therefore, he recruits Miller to take Julie to Earth's moon to be safe. Ironically, Julies disobeys her father's orders and instead joins a terrorist group that promises her safety.
The Canterbury Spaceship
The author describes the Canterbury Spaceship as the most secure transport for Holden's crew to outer space. The UN security committee on Earth is sure of the crew's safety and looks forward to a positive exploration of outer space. Paradoxically, the Martian army easily destroys the Canterbury Spaceship before it lands in outer space. The destruction of the Canterbury Spaceship contradicts the expectations of the UN and Harold’s confidentiality.
Dramatic irony
Readers know the outcome of Miller’s assignment, but Miller thinks that he will accomplish his mission of rescuing Julie. For instance, readers know that the Outer Space Alliance (OPA) is a deadly terror group intended to frustrate Miller's assignment. However, Miller follows Julie after she joins OPA thinking that he will bring her out successfully. Ironically, Miller fails terribly because OPA threatens to take his life. Later, Miller tells Mr. Magnate that taking Julie to Earth's moon is a nightmare assignment.