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From: "Jeffrey R. Carter" <ggsub@pragmada.co.cc>
Newsgroups: comp.lang.ada
Subject: Re: Curiosity rover on Mars
Date: Wed, 8 Aug 2012 11:31:11 -0700 (PDT)
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Date: 2012-08-08T11:31:11-07:00
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On Wednesday, August 8, 2012 7:41:05 AM UTC-7, Peter C. Chapin wrote:
> The Curiosity rover successfully landed on Mars earlier this week. 
> Congratulations to NASA and to all those who worked on the daring and 
> controversial new landing system---which apparently worked perfectly. I 
> saw a NASA video that mentioned that there was 500,000 lines of code in 
> the EDL (Entry, Descent, and Landing) system. Does anyone happen to know 
> if there is any Ada on board that spacecraft?

According to

http://programmers.stackexchange.com/questions/159637/what-is-the-mars-curiosity-rovers-software-built-in

it's in C, possibly "mostly auto-generated".