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At the moment only rigorously tested humans have experienced the conditions of space. If off-world colonization someday begins, many types of people will be exposed to these dangers, and the effects on the very young are completely unknown. On October 29, 1998, John Glenn, one of the original Mercury 7, returned to space at the age of 77.
In the US human space program, the only in-flight countermeasure to skeletal muscle functional deficits that has been utilized thus far is physical exercise. In-flight exercise hardware and protocols have varied from mission to mission, somewhat dependent on mission duration and the volume of the spacecraft available.
A weakened heart can result in low blood volume, low blood pressure and affect the body's ability to send oxygen to the brain without the individual becoming dizzy. [69] Heart rhythm disturbances have also been seen among astronauts, but it is unclear whether this was a result of pre-existing conditions or an effect of the micro-g environment. [70]
Bruce McCandless II free-floating in space more than 320 feet away from the Challenger space shuttle. Photo: Reuters. McCandless was the first person to spacewalk untethered on February 7, 1984 ...
effects on biological damage related to differences between space radiation and x-rays; dependence of risk on dose-rates in space related to the biology of DNA repair, cell regulation and tissue responses; predicting solar particle events (SPEs) extrapolation from experimental data to humans and between human populations
Humanity has reached different types of astronomical bodies, but the longest and most diverse presence (including non-human, e.g. sprouting plants [54]) has been on the Moon, particularly because it is the first and only extraterrestrial body having been directly visited by humans. Space probes have been establishing and mediating human ...
As of September 2023, the European Space Agency estimates 11,000 tons of space objects are orbiting Earth. That includes up to 36,500 pieces of debris greater than 10 cm, objects that could cause ...
Recently released photos of two NASA astronauts stranded aboard the International Space Station (ISS) have caused health concerns to rise. ... People are now worried about their well-being after a ...