Talk:List of artificial objects on extraterrestrial surfaces

message: This article was created as it served as a good parent page to three existing pages (List of artificial objects on Venus, Moon and Mars) and as a place to list other man-made objects that we had landed on other bodies.
The three existing articles on the Moon, Mars and Venus were pretty extensive and I didn't want to repeat all of that as it seems to be on Landings on other planets. - CharlesC 19:35, 19 October 2006 (UTC)
replies: text: Very true which means do we even need Landings on other planets page at all.  Anything extra should be able to be merged to this page and the three sub pages. i 7 s 21:13, 20 October 2006 (UTC)
thread_title:  Merging 

message: "NASA currently has plans to steer the main spacecraft into Saturn's atmosphere after its mission ends to prevent the contamination of Titan's surface by any terrestrial microbes."
Any source for that statement? --83.144.95.66 18:52, 11 March 2007 (UTC)
replies: text: As you can see in http://saturn.jpl.nasa.gov/faq/huygens.cfm#q2 there is no significant risk of contamination of Titan (the environment is very hostile to earth-based life forms).  But it still may be true that they plan on steering the craft into Saturn, like they did Gallileo, so I'm don't know that the line should be deleted.  Fordsfords 19:31, 11 March 2007 (UTC)
replies: text: It doesn't make sense. If there are microbes on Cassini that originated on Earth, wouldn't they also have contaminated Huygens? If so, then Huygens took them down to Titan. Or do they think Cassini picked up new microbes while flying in the area of Saturn - genus Saturnius?! Wouldn't Cassini and Huygens have been sterilized before leaving Earth? I'd be more inclined to think NASA wants to plunge it into Saturn for a nice neat ending rather than having Cassini power down and not know when/how/where it meets its ultimate fate. Me, I'd say to send it for a ride along the rings, getting closer and closer shots of them until debris shreds the spaceship. GBC (talk) 05:59, 26 February 2008 (UTC)
thread_title:  Source 

message: I just added a note about the Deep Impact projectile, but now I'm wondering because I'm not actually sure what happened to the projectile after impact. Is it still there, embedded in the comet? Or did it vapourise on impact? Or was it deflected off into space again? I guess it it isn't stil there then it doesn't qualify? Anyone got any info about this? Matt 23:02, 20 May 2007 (UTC)
replies: text: The relative impact velocity was 37,000 km/h so I'm guessing in all likelihood that it was vaporized. However, there is still some ambiguity in the article as to whether it should contain the total masses of ALL objects that are now part of extraterrestrial worlds, vaporized or not, or only the masses of objects that are still more or less intact. We should really come up with a consensus. Checkguy 10:17, 22 May 2007 (UTC)
replies: text: Wow, that is fast. Including only "more-or-less intact" objects could create problems in trying to judge between different degrees of destruction. For example, according to this even Ranger 4 (included at List of artificial objects on the Moon) impacted at 9,617 km/h. Whether that's fast enough to vapourise much of the probe I don't know, but it must have left it pretty unrecognisable. Matt 02:23, 23 May 2007 (UTC)
replies: text: If it has been vapourised I suppose it can't really be described as an object any more and shouldn't be in the main list, however I think these event are still worth noting, so (as I mentioned in the top section on this talk page) perhaps we should go for a secondary list noting vapourised objects and those sent into the gaseous planets. If this is significant, perhaps another column is needed on the other related pages such as List of artificial objects on Mars to show whether mostly intact or not. -CharlesC 12:22, 26 August 2007 (UTC)
thread_title:  Deep Impact projectile 

message: I would like to see this added   and............    Infocat13 03:59, 25 August 2007 (UTC)
thread_title:  List of artificial objects in solar orbit 

message: objects such as the pioneer and voyagers and there solid upper stages      Infocat13 03:59, 25 August 2007 (UTC)
thread_title:  list of artificial objects in solar system escape orbits 

message: Does anyone have a source on the mass of the target marker that was left on Itokawa? I've reverted the edit from 591kg back to 0.591 kg because the former is definitely not correct and the latter also seems to be too much mass for such a thing, but seems more reasonable Checkguy (talk) 01:28, 5 December 2008 (UTC)
replies: text: Some time ago I spent a while looking for that info, but couldn't seem to find out much about it unfortunately. --CharlesC (talk) 11:25, 5 December 2008 (UTC)
thread_title:  Itokawa