Children at Sea Mills Primary School in Bristol are aiming to set a new world record for the largest number of people dressed as astronauts.
Teachers and parents joined some 250 youngsters in astronaut costumes to set a new Guinness World Record.
It is part of a charity event to coincide with World Science Day next month.
The children will find out in the coming weeks if they have actually broken the record.
Guinness World Records will be looking at an evidence pack sent to them by the school before officially awarding the record.
To ensure that all of the astronauts are dressed appropriately within the Guinness World Record guidelines the participants were given their own “spacesuit” (AKA as a white boiler suit) and gloves.
Everyone provided their own foil covered wellington boots and the school organised space helmet making sessions.