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Philae is a tiny little 100kg add on … 29 times heavier Rosetta (the orbiter) is the main course, Philae is this tiny little and quite experimental (though admi
by arrrg 11y ago
Philae is a tiny little 100kg add on … 29 times heavier Rosetta (the orbiter) is the main course, Philae is this tiny little and quite experimental (though admittedly extremely cool – mostly because of exactly its novel mission) little hitchhiker.
RTGs are heavy and consequently have pretty much only been used on much heavier spacecraft and even then mostly only when being solar powered just wasn’t an option. For Philae, besides it being very lightweight, being solar powered was and is an option and the only reason it didn’t work out is because things went wrong during the landing …
How in the hell do you even get the idea that Nasa would have used an RTG in ESA’s place here?! They are not psychic. They couldn’t have predicted things going wrong during the landing … and why then put an RTG on this when that’s something Nasa themselves does only very, very rarely and only for very different missions with much more demanding payloads?!
What is this insanity? Why the need to get onto this political pulpit and spew out some unrelated political propaganda because you feel like what? What’s the point of this deliberate and pointless provocation?! Huh? I’m confused and angry at this abundance of irrationality.
- tdicola 11y agoRTGs don't have to be heavy and big. Sure one to power a car sized rover like Curiosity with large motors, science equipment, lasers, etc will be big. But one to power a little probe with 24 watts would be tiny. In the 70s there were actually nuclear powered pace makers implanted inside people, so the technology can definitely scale down: https://www.orau.org/ptp/collection/Miscellaneous/pacemaker.htm https://www.orau.org/ptp/collection/Miscellaneous/pacemaker....
- deleted 11y ago[deleted]
- arrrg 11y agoSo why doesn’t Nasa use them all the time?
- AnkhMorporkian 11y agoTwo reasons. One, in a lot of situations solar power is essentially guaranteed, and when there's no chance that there won't be sun solar panels are a hell of a lot cheaper. Second, there's a plutonium shortage in the US at the moment [1] making it really hard to secure an RTG. [1] http://www.wired.com/2013/09/plutonium-238-problem/ http://www.wired.com/2013/09/plutonium-238-problem/