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Astronomical Achievements

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First spacecraft to successfully land on Mars

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Vertical Clues

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First artificial satellite
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Planet discovered by William Herschel in 1781
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Spacecraft that photographed Pluto up close
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Robotic rover that explored Mars\' Gale Crater
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Famous moon landing mission
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Spacecraft that took the first close-up images of Jupiter
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Exploration mission to Saturn and its moons
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Famous moon landing mission
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Observatory in space for X-ray astronomy

Horizontal Clues

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First spacecraft to successfully land on Mars
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Space telescope launched in 1990
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Country that launched the first human into space
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First American to orbit the Earth
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NASA\'s mission to study the outer planets
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International laboratory in low Earth orbit
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Planet discovered through mathematical predictions
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Astronomer who proposed heliocentric theory
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First artificial satellite to orbit the Moon
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Robotic spacecraft sent to study a comet
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Chinese space station launched in 2021
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Region of space with high density of stars