Hello, friends! If you happen to have any radiation protection clothing lying around—like those lead aprons they give you for X-rays at the dentist—I recommend putting it on now before you read any further. In today’s post, we’ll be exploring the radiation environment of Europa.
Europa is often listed as one of the top four places in the Solar System where we might find alien life. That makes exploring Europa a top priority for NASA and other space agencies. Unfortunately, Europa is one of the moons of Jupiter, with an orbit that puts Europa deep inside Jupiter’s radiation belts.
Radiation is going to be a problem wherever you go in space, but the radiation belts around Jupiter are extra scary. If you were to spend a few days on the surface of the Moon or Mars without any sort of radiation protection gear, you’d end up with a significantly higher risk of developing cancer at some point later in life. If you spent a similar amount of time on the surface of Europa without radiation protection, you wouldn’t live long enough to worry about cancer. Radiation sickness would kill you in a matter of days—maybe a matter of weeks, if you’re “lucky.”
Even robotic spacecraft have a tough time dealing with Jupiter’s radiation belts. The Juno mission, currently orbiting Jupiter, has all its mission critical electronics sealed up inside what NASA calls a radiation vault. It’s basically a big, heavy box with thick walls made of titanium. The radiation vault cannot block all of the radiation, but it blocks enough of it that Juno should survive long enough to finish its mission.
NASA’s upcoming Europa Clipper mission, which will take an even closer look at Europa, will be equipped with a similar radiation vault.
Before we end today’s post, some of you may be wondering what all this radiation means for potential alien organisms living on Europa. Well, it probably wouldn’t affect them much, if at all. The aliens (if they exist) would be swimming around in Europa’s subsurface ocean, beneath several kilometers worth of water ice. And large quantities of water happen to be one of the very best radiation shields nature can provide.
WANT TO LEARN MORE?
- “Colonization of Europa” from Wikipedia. Yeah, it’s a Wikipedia article, but if you’re interested in what it would take to put human beings on the surface of Europa, this article is a pretty good place to start.
- “Juno Armored Up to Go to Jupiter” from nasa.gov. This is a press release from 2010, when the Juno spacecraft was still under construction. It describes, in plain English, what Juno’s radiation vault is and why Juno needs it so badly.
- “Spent Fuel Pool” from What If? For those of you who didn’t know about water’s incredible radiation blocking powers, this is an amusing look at water’s incredible radiation blocking powers.