Answer: 1.Temperature.
2.Radiation.
3.Motion sickness.
4.Bone and Muscle Deterioration.
5.Fluid redistribution
Nasa advances their space weather forecasting models. It helps to have spacecraft at different vantage points between the Sun and Earth. Launched in 2018, NASA's Parker Solar Probe is flying closer to the Sun than any spacecraft before it.
Hope this helps!!!!!-Branlist?!?
