Astronauts can’t cry the same in space as they do on Earth. Your eyes make tears but they stick as a liquid ball. In fact, they sting a bit. So — space tears don’t shed. Unless an astronaut wipes that water away, tears in space can form a giant clump that can break free of your eye, as The Atlantic explained.

Do astronauts in space sneeze less than when they are on earth? They sneeze a LOT more. This is actually an issue aboard the ISS. In fact, some astronauts/cosmonauts up there have reported they sneeze up to 100 times a day (For me, I think I probably sneeze about once or twice a week here on Earth!).

Six-time spacewalker Dave Wolf, currently flying on the International Space Station, said astronauts can’t stop from sneezing inside their spacesuits, and there’s no way to blow your nose. …

A cough or sneeze on Earth blasts infectious particles from 3 to 6 ft. (1 to 2 m) away before gravity takes over and they fall out of the air. In space, they float everywhere. When they do land, they don’t settle in some safe, out of the way place, because in a spacecraft there is no out of the way.

Actually, the temperature is colder in space than on Earth, as we have an atmosphere which keeps us warm. So at the same distance as the Earth from the Sun it’s about -50 degrees in space. On Earth, we lose heat through radiation, evaporation of sweat and by conduction of heat to the air.

Since there is no way to conduct heat, the temperature of the objects in the space will remain the same for a long time. Hot objects stay hot and cold things stay cold. But, when the sun’s radiations enter the earth’s atmosphere, there is a lot of matter to energize. Hence, we feel the radiation of the sun as heat.

At our distance from the sun, if you put, say, a Mac Truck in space, the side facing the sun will quickly get hot enough to burn you. The reason is obvious: sunlight contains energy, and in near-Earth space, there is no atmosphere to filter that energy, so it’s even more intense than it is down here.