Kamal Ghorui
While space agencies are making significant preparations for long-term missions to the Moon and Mars, a fundamental human query is emerging: can life be initiated outside of Earth? While space travel has progressed significantly, human reproduction in space is an unexplored area of uncertainty. Scientists are using animal research, lab experiments, and space missions to investigate how the human body would react to space. The findings, so far, show that although the process of human reproduction in space may not be entirely impossible, it is definitely more complex than what we experience here on Earth. From microgravity to space radiation, there are many challenges to the process of human reproduction in space, which could be crucial in all the phases of the process, making it a crucial research aspect.
Why microgravity makes fertilisation difficult in space
One of the biggest hurdles in pregnancy in space is microgravity. On Earth, gravity is known to play a crucial role in the functioning and behaviour of cells, as well as in fluids and biological events. However, in space, this balance is disrupted. According to NASA’s research on developmental and reproductive biology, it is known that microgravity affects the functioning of reproductive cells. These include the functioning of sperm and fertilisation. A recent study published in Communications Biology revealed that sperms exposed to microgravity showed diminished motility. This means that sperm were not functioning properly and were unable to swim towards the egg. This greatly reduces the chances of fertilisation. This is important because fertilisation is the first step in pregnancy. The functioning of sperm in space is uncertain, and hence, it is uncertain from the very first step.
What animal studies reveal about space pregnancy
Since there is limited research in this domain among humans, the best option available to the scientific community is to rely on animal models, especially mice, to get a fair idea about the possible mechanism of reproduction in space. This is because the reproductive system of mammals is quite similar.The journal Proceedings of the National Academy of Sciences (PNAS) has published research about frozen embryos of mice that were later exposed to space conditions in the International Space Station. What is noteworthy is the fact that some of these embryos were able to develop healthy babies when they returned to Earth.However, the news is not entirely good either. Other research has indicated that embryos are more vulnerable to the conditions of space. If they are exposed to microgravity at the early stages of development, they may either develop abnormally or fail to develop at all.This indicates that although the process of reproduction is possible, there is nothing to guarantee its success.
Radiation: The invisible threat to space reproduction
Apart from the effects of microgravity, another problem that faces pregnant women in space is cosmic rays. On Earth, we are protected by the atmosphere and the magnetic fields. However, in space, this protection is lacking.Scientific studies at Harvard have proven that cosmic rays can damage the DNA in reproductive cells. This damage can impair fertility and may cause developmental problems in the embryo.Experiments carried out on animals have proven that when they are exposed to cosmic rays, the levels of hormones in the body are altered. The reproductive process in the body is impaired, and the viability of the embryo is reduced.For the developing baby in the womb, the effects of cosmic rays are even more alarming. The baby’s development could be impaired by the cosmic rays. This is one of the most important issues that needs to be addressed in the context of pregnancy in space.
A complex possibility: Not an impossibility
So, can humans get pregnant in space? The scientific answer to this is still uncertain. There is no clear indication that it is absolutely impossible, but there are enough challenges to make it extremely dangerous.It may be less efficient for fertilisation to take place, for an embryo to develop, and for the environment to be less hazardous compared to what we experience on Earth. On the other hand, the success of some animal experiments gives us a glimpse of what could be possible in the future.
