Brit spacewoman aims to walk on Mars – major challenge is one nobody thinks of
![Brit spacewoman aims to walk on Mars – major challenge is one nobody thinks of](https://i2-prod.mirror.co.uk/incoming/article33343180.ece/ALTERNATES/s615/0_Rosemary-Coogan-graduates-from-space-training.jpg)
Astronaut Rosemary Coogan is keen to visit Mars one day - but explains the challenges humans face to get there which has led to Nasa predicting the mission won't take place until at least the 2040s