When will they send a man to Mars?

It is difficult to predict exactly when a manned mission to Mars will take place, as it depends on a number of factors such as technological developments, funding, and the readiness of the participating space agencies and countries.

That being said, there have been several plans and proposals for manned missions to Mars in the coming decades.

NASA has a long-term goal of sending humans to Mars in the 2030s, and is currently working on developing the technology and infrastructure needed for such a mission. The agency is currently working on the Artemis program, which aims to land humans on the Moon by 2024 and establish a sustained human presence there as a stepping stone for future missions to Mars.

Other space agencies and private companies are also working on plans for manned missions to Mars. For example, SpaceX, a private space exploration company founded by Elon Musk, has announced its intention to send humans to Mars as early as 2024 with its Starship spacecraft. The company is currently testing prototypes of the spacecraft and working on developing the necessary technology and infrastructure for a manned mission to Mars.

Overall, it is likely that a manned mission to Mars will take place within the next few decades, but it is difficult to say exactly when this will happen.