Shulagh,
thank you for the poem suggestion for the prompt, this is sure to get the children started! https://poetry4kids.com/poems/im-building-a-rocket/
and the author states:
You are welcome to use the poems from my books and website in your classroom activities. You may photocopy them, enlarge them, illustrate them, or do just about anything you like with them
The verse that has
But what do you mean
when you ask how we’ll land?
offers a whole “take the next step” for the Rocket Mice, since these do tend to fly off in random directions. Children could measure how far from the launch did the mouse land and consider ways to make it land closer.