Someone Planned a Crewed Mission to Mars in the 1960s and It Would Have Been Spectacular - autoevolution
What was the space race? | Space
Ranger | Moon Exploration, Lunar Imaging & Mapping | Britannica
NASA - NSSDCA - Spacecraft - Details
Timeline of the Space Race, 1957–69 | Britannica
Probes to the Outer Planets | Historic Spacecraft
50 Years After First Interplanetary Probe, NASA Looks To Future : NPR
Mars Probes | Historic Spacecraft
chapter 3
Mariner program - Wikipedia
Every mission to Mars ever | The Planetary Society
chapter 3
India & China: Contrasting Space Programs
Ulysses | Solar Wind, Jupiter & Sun | Britannica
A Sudden Loss of Altitude | Air & Space Magazine| Smithsonian Magazine
Mariner space probe hi-res stock photography and images - Alamy
What's Up There, Where Is It, and What's It Doing? The U.S. Space Surveillance Network | National Security Archive
List of NASA missions - Wikipedia
chapter 3
Mariner Exploration Missions
Space race timeline | Royal Museums Greenwich
Space exploration - Astronauts, Satellites, Stations | Britannica
List of Solar System probes - Wikipedia
:focal(1126x1410:1127x1411)/https://tf-cmsv2-smithsonianmag-media.s3.amazonaws.com/filer/50/16/5016b9d7-7a93-494d-aa28-5468c7053063/apollo_11_lunar_module.jpg "Apollo 11 Astronaut Michael Collins on the Past and Future of Space Exploration | Science| Smithsonian Magazine")
Apollo 11 Astronaut Michael Collins on the Past and Future of Space Exploration | Science| Smithsonian Magazine
