Is there life on Mars(火星)?We do not know.We are sure that earth people like us cannot live on Mars.Earth people need oxygen（氧气）to breathe(呼吸),but there is almost no oxygen on Mars.
Living on Mars is like living on a very high mountain.
There is little air on it.It is 50℃ about zero at noon and 100℃ below zero at night. Many people think there may be plants on Mars.We know that all plants and animals on the earth need carbon to grow.
Through a telescope(望远镜).Mars looks red.In some places it seems gray.At times the gray color turns gray-green,then brown,then gray again.The gray-green color may be a kind of plant life.It changes color with the seasons.
Will men go to Mars one day?If they do,they will have to take along their own oxygen,food,clothes and something to sleep in. 翻译