Live data from Hacker News

A Nuclear Probe to Explore Earth’s Interior

beyondearthlyskies.blogspot.com

11–20 of 67 posts

Re: A Nuclear Probe to Explore Earth’s Interior

#11

What a fascinating proposition. FYI: This blog article is from 2013 and is about scientific papers written in 2008 and 2005. A few minutes of cursory Googling turns up nothing else.

It was actually used as the basis of a Young Adult book in 2005 [1] or a very similar idea. The book uses a large molten ore body created from explosive charges.

[1] https://en.wikipedia.org/wiki/Artemis_Fowl:_The_Opal_Decepti...

Re: A Nuclear Probe to Explore Earth’s Interior

#12
post #7
post #2

Did this go anywhere? The only papers if find that reference the original ideas (2005 and 2008) mention nuclear waste that melts itself into the Earths core.

Probably not. That's a scary thing to build. Cobalt-60 gammas are hard to shield, and 2000K is really hot. The laws of physics don't forbid building such a thing, but I wouldn't want to be in the same building with it. Okay, so you have something that's so self-heating that it'll easily melt rock. In fact, it's hot enough that it self-liquifies quickly at STP. Cobalt reacts weakly with oxygen, but you'll still have t…

I imagine the safe way of deploying the thing would be to assemble it on-site, over the bore hole, robotically. Don't have any humans anywhere near the entire operation as long as all of that cobalt is in the same place (deliver it to the site with several delivery missions, each only having a relatively safe amount of cobalt).

(Apparently the cobalt would be inserted into the tungsten sphere as a not-yet-liquid sphere. That would make the multiple deliveries and robotic assembly more difficult, so maybe a liquid-assembly like you suggest could be arranged.)

How the hell do you weld tungsten anyway? Maybe make the sphere in two halves, then spin them up in opposite directions and push them together, to friction weld them?

Re: A Nuclear Probe to Explore Earth’s Interior

#13
post #8

Seems that the technique would also work on Europa to melt its way into the ocean underneath the ice.

But if there really is live down there, how do you then explain to them that you just dropped some nuclear waste into their ocean?

"We have reasons to believe you posses weapons of mass destruction"

Worked fine with all the depleted uranium dropped on Iraq.

Re: A Nuclear Probe to Explore Earth’s Interior

#15
post #12
post #7

Earlier quoted context omitted.

Probably not. That's a scary thing to build. Cobalt-60 gammas are hard to shield, and 2000K is really hot. The laws of physics don't forbid building such a thing, but I wouldn't want to be in the same building with it. Okay, so you have something that's so self-heating that it'll easily melt rock. In fact, it's hot enough that it self-liquifies quickly at STP. Cobalt reacts weakly with oxygen, but you'll still have t…

I imagine the safe way of deploying the thing would be to assemble it on-site, over the bore hole, robotically. Don't have any humans anywhere near the entire operation as long as all of that cobalt is in the same place (deliver it to the site with several delivery missions, each only having a relatively safe amount of cobalt). (Apparently the cobalt would be inserted into the tungsten sphere as a not-yet-liquid sphe…

Tungsten is usually sintered with a binder. I'm unaware of any welding techniques that work with it.

For a similar fabrication job, check out the LARES satellite (which is awesome, elegant, and the densest free-falling object in the Solar System):

http://www.esa.int/Our_Activities/Launchers/Launch_vehicles/...

Re: A Nuclear Probe to Explore Earth’s Interior

#18
post #16

> As the probe descents deeper, the rate of descent will gradually slow until the probe reaches a depth of 100 km after ~30 years The article doesn't mention - why will the probe stop descending?

Increase in density as you get closer to the core.

Re: A Nuclear Probe to Explore Earth’s Interior

#19
post #8

Earlier quoted context omitted.

But if there really is live down there, how do you then explain to them that you just dropped some nuclear waste into their ocean?

"We have reasons to believe you posses weapons of mass destruction" Worked fine with all the depleted uranium dropped on Iraq.

Europeans (pun intended) could be much better equipped to retaliate than Iraqis.

Re: A Nuclear Probe to Explore Earth’s Interior

#20
post #17

The article also suggests using the probe to analyze the composition of other planets. Is that doable? It seems pretty tough to me to carry on a space ship a nuclear probe hot enough to melt rocks.

If you're going to carry a probe powerful enough to melt rocks on a spaceship, the probe better damn well be nuclear powered. There's no other way to get the energy density to make the launch costs feasible.
Post reply on HN