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The Human Body in Space: 6 Weird Facts. By Miriam Kramer, Space.com Staff Writer | April 18, 2013 05:40pm ET Credit: NASAFrom trouble sleeping to wimpy muscles, living on board the International Space Station really does a number on the human body.

The Human Body in Space: 6 Weird Facts

Get to know how your body could react to life in orbit with these 6 fun facts: FIRST STOP: Astronauts Get Taller Miriam Kramer. Space exposure. Space exposure is the subjection of a human to the conditions of outer space, without protective clothing and beyond the Earth’s atmosphere in a vacuum.

Space exposure

Explanation and history[edit] For the effect of rapid decompression to vacuum conditions, see the main article at Uncontrolled decompression. Ebullism, hypoxia, hypocapnia and decompression sickness[edit] Few humans have experienced these four conditions. Joseph Kittinger experienced localised ebullism during a 31 kilometres (19 mi) ascent in a helium-driven gondola.[1] His right-hand glove failed to pressurise and his hand expanded to roughly twice its normal volume[6][7] accompanied by disabling pain. The only humans to have died of space exposure are the three crew members of the Soyuz 11 spacecraft: Vladislav Volkov, Georgi Dobrovolski and Viktor Patsayev.

Extreme temperature variations[edit] Extreme temperature variations are a problem in space, because heat exchange occurs primarily via infrared radiation. Explainer: How Hostile is Space? This article was originally published at The Conversation.

Explainer: How Hostile is Space?

The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Space may seem calm, but it is a more hostile environment than that on Earth. Invisible radiation is a big problem for space enthusiasts and scientific instruments. Substituting electronic devices to do human tasks reduces risk, but it doesn’t eliminate all risk.

Every active device in space is dealing with such risks right now – be it Rosetta the comet chaser or the satellite responsible for streaming live sports. Beyond the risk of colliding with other objects in space, there are four main dangers for such electronic devices: the empty vacuum, extreme temperature variability, small meteorite impacts and radiation damage. The temperature variation in space can be enormous. Small meteorite impacts are hard to predict but remain rare. There are three main radiation sources in space. Credit: Akhristov, CC BY. What Is the Fermi Paradox? The Fermi Paradox seeks to answer the question of where the aliens are.

What Is the Fermi Paradox?

Given that our star and Earth are part of a young planetary system compared to the rest of the universe — and that interstellar travel might be fairly easy to achieve — the theory says that Earth should have been visited by aliens already. As the story goes, Enrico Fermi (an Italian physicist) first came out with the theory with a casual lunchtime remark in 1950. The implications, however, have had extraterrestrial researchers scratching their heads in the decades since. "Fermi realized that any civilization with a modest amount of rocket technology and an immodest amount of imperial incentive could rapidly colonize the entire galaxy," the Search For Extraterrestrial Intelligence (SETI) said on its website.

Extraterrestrial life. Astrobiology. Astrobiology is the study of the origin, evolution, distribution, and future of life in the universe: extraterrestrial life and life on Earth.

Astrobiology

This interdisciplinary field encompasses the search for habitable environments in our Solar System and habitable planets outside our Solar System, the search for evidence of prebiotic chemistry, laboratory and field research into the origins and early evolution of life on Earth, and studies of the potential for life to adapt to challenges on Earth and in outer space.[2] Astrobiology addresses the question of whether life exists beyond Earth, and how humans can detect it if it does.[3] (The term exobiology is similar but more specific — it covers the search for life beyond Earth, and the effects of extraterrestrial environments on living things.)[4] Overview[edit] It is not known whether life elsewhere in the universe would utilize cell structures like those found on Earth.

(Chloroplasts within plant cells shown here.)[19] Methodology[edit]

Formation of life

Your Age On Other Worlds. Want to melt those years away?

Your Age On Other Worlds

Travel to an outer planet! <div class="js-required"><hr> This Page requires a Javascript capable browser <hr></div> Fill in your birthdate below in the space indicated. (Note you must enter the year as a 4-digit number!) Click on the "Calculate" button. The Days (And Years) Of Our Lives Looking at the numbers above, you'll immediately notice that you are different ages on the different planets.

Extra-terrestrial life