Before a new experimental method of making fuel from Martian resources, scientists saw no other option than to carry fuel for both directions of the trip. This is a new idea that is being tested in simulations on earth. Martian expeditions of today focus on the search for possible life on the red planet. These are conducted through machines costing billions that merely collect samples. We disagree with spending so much money on these kinds of experiments.
Probes take small samples that represent the entire planet.
The chances of finding life this way are close to nothing. True, checks should be made to prevent astronauts from being infected by Martian life that may exist. Nonetheless, we think the focus should be on the Martian landing. The cooperation between the United States and Russia, the technology of Japan, and the programs of Europe have been covered. As can be seen, different countries offer different advancements in technology.