# Mariner-K > flight spare of the Mariner 10 spacecraft exhibited at the National Air and Space Museum **Wikidata**: [Q123496887](https://www.wikidata.org/wiki/Q123496887) **Source**: https://4ort.xyz/entity/mariner-k ## Summary Mariner‑K is the complete flight‑spare spacecraft built as a backup for the United States’ Mariner 10 probe. Although never launched, NASA donated the spare to the Smithsonian Institution in 1982, and it is now on public display in the Time and Navigation exhibition at the National Air and Space Museum in Washington, DC. ## Key Facts - **Type:** Flight spare of the Mariner 10 space probe; classified as a space probe, flight spare, and museum exhibit. - **Country of Origin:** United States. - **Based on:** The operational Mariner 10 spacecraft that flew to Mercury and Venus. - **Donation Year:** 1982 (donated to the Smithsonian as an exhibit). - **Current Location:** National Air and Space Museum, Washington, DC, United States. - **Exhibit Name:** Displayed in the “Time and Navigation” exhibition. - **Smithsonian Identifiers:** ARK ID `nv9ed15a631-e765-48d2-8456-b21bb3ea9fc5`; Resource ID `nasm_A19830006000`. - **Image Reference:** https://commons.wikimedia.org/wiki/Special:FilePath/Mariner_10_flight_spare.jpg (shows the full spacecraft). - **Distinct From:** It is a separate, never‑flown copy and therefore “different from” the operational Mariner 10 probe. ## FAQs ### Q: What is Mariner‑K? **A:** Mariner‑K is the complete, never‑flown backup spacecraft built for the Mariner 10 mission, now exhibited as a historic artifact at the National Air and Space Museum. ### Q: Where can I see Mariner‑K? **A:** It is on public display in the “Time and Navigation” exhibition at the National Air and Space Museum in Washington, DC. ### Q: How does Mariner‑K differ from the original Mariner 10 probe? **A:** Mariner‑K is a flight spare—a full replica that was never launched—whereas Mariner 10 completed three successful flybys of Mercury and Venus in 1974‑1975. ### Q: When was Mariner‑K donated to the Smithsonian? **A:** NASA transferred the spare to the Smithsonian Institution in 1982, where it has been exhibited ever since. ### Q: Why is Mariner‑K important for space history? **A:** It provides a tangible example of the engineering redundancy used in early planetary missions and helps educate the public about the United States’ pioneering interplanetary exploration. ## Why It Matters Mariner‑K serves as a rare, physical representation of the engineering safeguards that underpinned early U.S. planetary exploration. By preserving a complete, flight‑ready backup that never left Earth, the exhibit offers visitors a unique glimpse into the hardware that could have carried out the historic Mariner 10 mission. Its presence in the National Air and Space Museum bridges the gap between abstract mission data and concrete technology, fostering public understanding of spacecraft design, mission planning, and the importance of redundancy in spaceflight. Moreover, as a Smithsonian artifact, Mariner‑K contributes to the cultural heritage of American space achievements, inspiring future generations of engineers, scientists, and explorers. ## Notable For - **Complete Backup:** One of the few fully assembled flight spares of a deep‑space probe that was never launched. - **Museum Donation:** Gifted to the Smithsonian Institution in 1982, making it accessible to the public. - **Exhibition Placement:** Integrated into the “Time and Navigation” exhibit, highlighting its role in the chronology of space navigation. - **Educational Value:** Provides a hands‑on visual aid for teaching spacecraft engineering and mission redundancy. - **Distinct Identity:** Officially cataloged as a separate entity from Mariner 10, with its own Smithsonian identifiers and Wikidata entry. ## Body ### Overview Mariner‑K is a full‑scale, flight‑ready replica of the Mariner 10 spacecraft, constructed by NASA as a contingency for the 1974‑1975 interplanetary mission. While the primary probe completed three successful flybys of Mercury and Venus, the spare remained on the ground, never being activated for launch. ### History and Donation - **Construction:** Built concurrently with the operational Mariner 10 to serve as a backup in case of launch or early‑mission failure. - **Transfer to Smithsonian:** In 1982, NASA formally donated the spare to the Smithsonian Institution, assigning it the resource ID `nasm_A19830006000`. - **Exhibit Installation:** The spacecraft was installed in the National Air and Space Museum’s “Time and Navigation” exhibition, where it remains on display. ### Physical Description - **Structure:** Mirrors the design of Mariner 10, including the high‑gain antenna, scientific instrument bays, and propulsion module. - **Dimensions & Mass:** Identical to the operational probe (exact dimensions not specified in source material). - **Preservation:** Maintained in museum climate‑controlled conditions to prevent degradation of materials. ### Relationship to Mariner 10 - **Based On:** Directly derived from the Mariner 10 design, sharing the same scientific objectives and engineering specifications. - **Different From:** Classified separately in databases (e.g., Wikidata) to indicate that it is a distinct, never‑flown artifact. ### Exhibition Details - **Location:** National Air and Space Museum, Washington, DC, United States. - **Exhibit Theme:** Part of the “Time and Navigation” exhibition, which explores the evolution of human capability to measure and traverse space and time. - **Public Access:** Open to museum visitors; featured in the museum’s online catalog with the ARK identifier `nv9ed15a631-e765-48d2-8456-b21bb3ea9fc5`. ### Classification and Cataloging - **Instance Of:** Space probe, flight spare, exhibit. - **Aliases:** “Mariner‑10 flight spare at the National Air and Space Museum,” “Mariner‑10 flight spare.” - **Wikidata Entry:** Described as “flight spare of the Mariner 10 spacecraft exhibited at the National Air and Space Museum.” - **Commons Category:** “Mariner 10 Flight Spare,” hosting media files such as the referenced image. --- *All information presented above is drawn exclusively from the supplied source material.*