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Across 4. ___, also known as MER-A or MER-2, is a robotic rover on Mars, active from 2004 to 2010 5. A ___ is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and – according to the International Astronomical Union but not all planetary scientists – has cleared its neighbouring region of planetesimals 9. ___ is the innermost and larger of the two natural satellites of Mars 11. The surface of the planet Mars appears reddish from a distance because of rusty dust suspended in the atmosphere 12. ___ is the third planet from the Sun and the only astronomical object known to harbor life 13. NASA 's ___ mission was a robotic space mission involving two Mars rovers, Spirit and Opportunity exploring the planet Mars 17. The ___ is the star at the center of the Solar System 18. The ___ is a gravity rounded astronomical body of planetary-mass, rocky silicate composition and without significant atmosphere, hydrosphere or magnetic field 19. A polar ice cap or polar cap is a high- latitude region of a planet, dwarf planet, or natural satellite that is covered in ice 24. ___, also known as MER-B or MER-1, and nicknamed " Oppy ", is a robotic rover that was active on Mars from 2004 until the middle of 2018 25. Asteroids are minor planets, especially of the inner Solar System 26. An ___ is an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body 27. ___ is the smaller and outermost of the two natural satellites of Mars 28. An ___ , meaning 'vapour', and σφαῖρα , meaning 'ball' or 'sphere' is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body 30. A ___ is any type of aircraft, rocket or spacecraft landing that does not result in significant damage to or destruction of the vehicle or its payload, as opposed to a hard landing 31. A ___ is a spacecraft that descends towards, and comes to rest on, the surface of an astronomical body 32. ___ was a robotic automatic interplanetary station of the Soviet Mars program, launched May 28, 1971, nine days after its twin spacecraft Mars 2 33. The National Aeronautics and Space Administration is an independent agency of the USA

Down 1. ___ is a system of canyons that runs along the Martian surface east of the Tharsis region 2. A ___, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals 3. ___ was the fourth in a series of spacecraft intended for planetary exploration in a flyby mode 4. ___ is a robotic Mars rover that landed on July 4, 1997 in the Ares Vallis region 6. The planet Mars has been explored remotely by spacecraft 7. The North Polar Basin, more commonly known as the ___, is a large basin in the northern hemisphere of Mars that covers 40% of the planet 8. ___ is an American robotic spacecraft that landed a base station with a roving probe on Mars in 1997 10. The ___ was the national space program of the Union of Soviet Socialist Republics, active from the 1950s until the state's collapse in 1991 14. The Mars trojans are a group of Trojan objects that share the orbit of the planet Mars around the Sun 15. ___ is a space exploration mission being conducted by the European Space Agency 16. A ___ is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface 17. The ___ is the gravitationally bound system of the Sun and the objects that orbit it, either directly or indirectly 20. ___ is a very large shield volcano on the planet Mars 21. ___ was the first of two spacecraft sent to Mars as part of NASA 's Viking program 22. ___ or ferric oxide is the inorganic compound with the formula Fe 2 O 3 23. ___ is the smallest and innermost planet in the Solar System 29. In ancient Roman religion and myth, ___ was the god of war and also an agricultural guardian, a combination characteristic of early Rome