Сделать вопрос косвенным, на . начинать так: "they " 1. has anybody landed on mars ? 2. is there life on venus ? 3. will people live on the moon some day ? 4. do astronauts often visit space flight control center ? 5. are there any aliens out there ?

1.They ask if anybody had landed on Mars.
2. They asked if there was a life on Venus.
3.They asked if people would live on the moon one day.
4.They asked if astronauts often visited Space Flight Control Centre.
5.They asked if there were some aliens out there.