Pyle, Rod. Destination Mars. Prometheus Books, 2012, p. 73–78. ISBN 978-1-61614-589-7. «It was the first spacecraft to enter orbit around another world. ... [It] continues to orbit Mars to this day, sailing around the planet deaf and dumb in the cold darkness.»
Pyle, Rod. Destination Mars. Prometheus Books, 2012, p. 73–78. ISBN 978-1-61614-589-7. «It was the first spacecraft to enter orbit around another world. ... [It] continues to orbit Mars to this day, sailing around the planet deaf and dumb in the cold darkness.»
