Here's a breakdown of spacecraft that have visited Mars, categorized by type of mission:
Flybys:
* Mariner 4 (1964): First successful flyby of Mars, sending back the first close-up images.
* Mariner 6 & 7 (1969): Further flybys capturing more detailed images and atmospheric data.
* Mariner 9 (1971): First spacecraft to orbit Mars, mapping a significant portion of its surface.
* Viking 1 & 2 (1975): Primary goal was to search for signs of life on Mars, using orbiters and landers.
* Phobos 2 (1989): Soviet mission designed to study Mars and its moon Phobos, failed before reaching Phobos.
* Mars Express (2003): European Space Agency orbiter currently studying Mars' atmosphere, surface, and subsurface.
* Mars Reconnaissance Orbiter (2005): NASA orbiter studying the Martian climate, geology, and potential for past and present life.
* MAVEN (2013): NASA orbiter studying the Martian atmosphere and its interaction with the solar wind.
* ExoMars Trace Gas Orbiter (2016): Joint ESA/Roscosmos mission investigating the Martian atmosphere for traces of methane and other gases.
Landers:
* Viking 1 & 2 (1976): First successful landers on Mars, conducting experiments to search for life and study the surface.
* Mars Pathfinder (1997): Demonstrated the use of an airbag landing system and deployed the Sojourner rover.
* Spirit & Opportunity (2004): Two robotic rovers, exploring the surface and searching for signs of past water activity.
* Phoenix (2008): Lander designed to study the Martian polar ice caps and search for signs of past or present life.
* Curiosity (2012): NASA rover studying the Martian geology and climate, searching for signs of past habitability.
* InSight (2018): Lander studying the Martian interior and seismology.
* Perseverance (2021): NASA rover exploring Jezero Crater, collecting samples for future return to Earth.
Orbiters & Landers (Combined):
* Mars Global Surveyor (1997): Mapped the entire Martian surface in high resolution.
* Mars Odyssey (2001): Currently orbiting Mars, studying its surface composition, minerals, and water ice.
Future Missions:
* ExoMars Rosalind Franklin Rover (2023): Joint ESA/Roscosmos mission designed to search for signs of past life.
* Mars Sample Return (2026+): Joint NASA/ESA mission to retrieve samples collected by Perseverance and return them to Earth.
This list is not exhaustive, but it encompasses the most significant spacecraft missions that have visited Mars. The continuous exploration of Mars is a testament to humanity's fascination with this enigmatic red planet.
