article_snippet:  evidence of nitrogen on Mars Mars once being habitable is steadily growing, as samples collected by Nasa’s Mars Curiosity rover have revealed a key ingredient for life in Martian rock.
article_snippet: Nasa scientists in California found evidence of nitrogen on Mars.
article_snippet: In their paper, the team of researchers said nitrates - a source of nitrogen for life on Earth could indicate the first stage of a primitive nitrogen cycle on the surface of MarsMars.
article_snippet: This could have provided a biochemically accessible source of nitrogen for life on Mars.
article_snippet: Discovery of indigenous martian nitrogen in Mars surface materials has important implications for habitability and, specifically, for the potential evolution of a nitrogen cycle at some point in martian history,’ Discovery of indigenous martian nitrogen in Mars surface materials wrote.
article_snippet: The next step will be to see if nitrates are still being produced on Mars.
article_snippet: In their paper the team of researchers said nitrogen could indicate the first stage of a primitive nitrogen cycle on the surface of MarsMars.
article_snippet: This could have provided a biochemically accessible source of nitrogen for life on Mars .
highlights_snippet: Nasa scientists in California found evidence of nitrogen on Mars .
  