Titan Submarine: Exploring the Depths of Kraken Mare
Earlier this month, NASA published a video introducing its concept submarine designed to explore Kraken Mare, one of the liquefied methane seas on Titan, the remarkably strange moon circling Saturn. T...
Space Station Freedom
Space Station Freedom was a NASA project to construct a permanently manned Earth-orbiting space station in the 1980s. Although approved by then-president Ronald Reagan and announced in the 1984 State ...
Space Station Freedom - Wikipedia
Mars-Aster
Mars-Aster was a proposed mission to Mars by Russia.
Mars-Aster - Wikipedia
Pioneer H
Pioneer H is an unlaunched unmanned space mission that was part of the US Pioneer program for a planned 1974 launch. Had this mission and spacecraft been launched, it would have been designated Pione...
Pioneer H - Wikipedia
Rotary Rocket
Rotary Rocket Company of Mojave, California, was a rocketry company headquartered in a 45,000-square-foot (4,200 m) facility at Mojave Airport that developed the Roton concept in the late 1990s a...
Rotary Rocket - Wikipedia
Boeing X-20 Dyna-Soar
The Boeing X-20 Dyna-Soar ("Dynamic Soarer") was a United States Air Force (USAF) program to develop a spaceplane that could be used for a variety of military missions, including reconnaissance, bombi...
Boeing X-20 Dyna-Soar - Wikipedia
Soyuz 7K-LOK
The Soyuz 7K-LOK, or simply LOK (Russian: Lunniy Orbitalny Korabl meaning "Lunar Orbital Craft") was a Soviet spacecraft designed to launch men from Earth to circle the moon and developed in paral...
Soyuz 7K-LOK - Wikipedia
Voyager program (Mars)
The Voyager Mars Program was a planned series of unmanned NASA probes to the planet Mars. The missions were planned, as part of the Apollo Applications Program, between 1966 and 1968 and were schedu...
Champollion (spacecraft)
Champollion was a planned cometary rendezvous and landing spacecraft. It was named after Jean-François Champollion, a French Egyptologist known for translating the Rosetta Stone.
As originally env...
Champollion (spacecraft) - Wikipedia
North American DC-3
The DC-3 was a proposed space shuttle designed by Maxime Faget at the Manned Spacecraft Center (MSC) in Houston. The design was nominally developed by North American Aviation (NAA), although it was a ...
Tsiolkovsky mission
The Soviet space program was the rocketry and space exploration programs conducted by the former Union of Soviet Socialist Republics (the Soviet Union or USSR) from the 1930s until its dissolution in ...
Tsiolkovsky mission - Wikipedia
Hopper (spacecraft)
Hopper was a proposed European Space Agency orbital and reusable launch vehicle. The shuttle prototype spaceplane was one of several proposals for a European reusable launch vehicle (RLV) planned to ...
SERV
SERV, short for Single-stage Earth-orbital Reusable Vehicle, was a proposed space launch system designed by Chrysler's Space Division for the Space Shuttle project. SERV was so radically different fro...
SERV - Wikipedia
Fuji (spacecraft)
Fuji (ふじ) was a manned spacecraft of the space capsule kind, proposed by Japan's National Space Development Agency (NASDA) Advanced mission Research center in December 2001. The Fuji design was ultima...
Fuji (spacecraft) - Wikipedia
MAKS (spacecraft)
The MAKS (Multipurpose aerospace system) (Russian: МАКС (Многоцелевая авиационно-космическая система)) is a cancelled Soviet air-launched with orbiter Reusable launch system project that was proposed ...
MAKS (spacecraft) - Wikipedia
Columbus (spacecraft)
The Columbus Man-Tended Free Flyer (MTFF) was a European Space Agency (ESA) program to develop a space station that could be used for a variety of microgravity experiments while serving ESA's needs fo...
Hermes (spacecraft)
Hermes was a proposed spaceplane designed by the French Centre National d'Études Spatiales (CNES) in 1975, and later by the European Space Agency. It was superficially similar to the US X-20. France p...
Hermes (spacecraft) - Wikipedia
Marco Polo (spacecraft)
Marco Polo was a proposed space mission studied between 2007 and 2010. It was for a near Earth asteroid sample return, and was considered for the ESA Cosmic Vision programme. It was superseded by the ...
Magnum (rocket)
The Magnum was a large super-heavy-lift rocket designed by NASA's Marshall Space Flight Center during the mid-1990s. The Magnum, which never made it past the preliminary design phase, would have been ...
Magnum (rocket) - Wikipedia
Reusable Booster System
The Reusable Booster System (RBS) was a United States Air Force research program, circa 2010 to 2012, to develop a new prototype vertical-takeoff, horizontal-landing (VTHL) reusable booster and a new...
Jupiter Icy Moons Orbiter
The Jupiter Icy Moons Orbiter (JIMO) was a proposed NASA spacecraft designed to explore the icy moons of Jupiter. The main target was Europa, the suspected ocean of which is one of the places where si...
Jupiter Icy Moons Orbiter - Wikipedia
Pluto Kuiper Express
The Pluto Kuiper Express mission was a space mission designed to flyby the Pluto–Charon system and at least one other large object in the Kuiper belt beyond Pluto's orbit. Originally designated the Pl...
Pluto Kuiper Express - Wikipedia
Advanced Gemini
Advanced Gemini is a number of proposals that would have extended the Gemini program by the addition of various missions, including manned low Earth orbit, circumlunar and lunar landing missions. Gemi...
Advanced Gemini - Wikipedia
Blue Gemini
Blue Gemini was a United States Air Force (USAF) project first proposed in August 1962 for a series of seven flights of Gemini spacecraft to enable the Air Force to gain manned spaceflight experience ...
Blue Gemini - Wikipedia
McDonnell Douglas DC-X
The DC-X, short for Delta Clipper or Delta Clipper Experimental, was an unmanned prototype of a reusable single stage to orbit launch vehicle built by McDonnell Douglas in conjunction with the United ...
McDonnell Douglas DC-X - Wikipedia
Astro-G
Astro-G (also known as VSOP-2, and very rarely called VSOP-B) was a planned radio telescope satellite by JAXA. It was expected to be launched into elliptic orbit around Earth (apogee height 25,000...