Because the amount of oxygen in space is not sufficient enough to sustain human life.
Because there is no air in space.
Robots might replace humans in space exploration for missions that are too dangerous or too remote for humans to reach, such as exploring harsh environments like the surface of Venus or deep space. Additionally, robots can be more cost-effective and efficient for certain tasks, especially in environments where human life support systems are challenging to maintain.
Only if they are in an enclosed capsule with a life-support system.
Well, we can be considered that, seeing as we are life on an outer space planet, but technically, since we are the only life, anything else that is found is considered an alien.
Animals were sent into space before humans to test the life support systems and to generate some data regarding the hazards and potential medical concerns for humans.
Life in space is a challenge for humans because you can't breathe like you do in earth as in space, you always eat dried food, and people who move in their sleep have to deal with being strapped to their bed.
It is impossible to know at our stage of development. Humans today can only see a small part of space. Maybe one day human or robots can adventure into space and possible find life in outer space.
A space shuttle isn't a probe, because humans are able to fly it. Not only that, but a space probe is most likely NOT to have life-support systems aboard.
Humans have not been able to find out when sharks nest. Did you know humans know more about outer space than sea life?
Life in space presents challenges for humans due to factors such as microgravity, radiation exposure, isolation, and limited resources. Extended periods in space can lead to muscle atrophy, bone loss, and effects on the cardiovascular system. Additionally, the lack of gravity requires adjustments in everyday activities such as eating, sleeping, and exercise.
Everything that you can think of about space (that is factual) is what humans know about space. Humans are the only reason we know space contains planets, stars, and moons.
Humans have not left outer space. The International Space Station is still crewed.