Did Viking 1 find life on Mars 50 years ago? Here's why the debate continues - Space

1. Did Viking 1 find life on Mars 50 years ago? Here's why the debate continues  Space
2. From Hampton to Mars: How NASA Langley Helped Land on the Red Planet  NASA (.gov)
3. Photos: 50 Years Since Viking 1 Landed on Mars  The Atlantic
4. On This Day: Viking 1 is first spacecraft to land on Mars  upi.com
5. Monday briefing: 50 years after Viking landed on Mars, did Nasa overlook evidence of life?  The Guardian