Any differences were directly related to changes in the solar energy that reached Mars.

Of course, we may yet go back to the moon, if only to use its light gravity to help us reach Mars.

Stranger things had happened in the days when it took eight months to reach Mars.

For each rocket, there is a set of five questions which the teams have to answer in order to reach Mars.

You'll not say another word until we reach Mars.

Dad built the first rocket to reach Mars back in 2036.

He had been the first to reach Mars, but that was a job only half done.

It takes between 3 and 22 minutes for a message to reach Mars.

When you reach Mars, tell them to hold the special and second prizes for me.

They wanted him to begin speaking now, knowing that it would take almost ten minutes for his words and image to reach Mars.