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Journey through our cosmic neighborhood with this quiz about the Sun, planets, moons, and everything in between. Test your knowledge of the fascinating facts that make up our Solar System!
Space Cadet 0–4 · Solar System Savant 5–8 · Cosmic Cartographer 9–10
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The Sun is truly enormous, with a diameter about 109 times that of Earth. Its immense size means that over a million Earths could be packed inside its volume. Despite its massive size, the Sun is considered an average-sized star in the galaxy, highlighting the vastness of the universe.
Photo: Matúš Motlo, Wikimedia Commons, CC BY-SA 4.0.
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The surface of Mars is rich in iron minerals, which, when exposed to oxygen, rust and form iron oxides. This process gives the planet its iconic red-orange appearance, earning it the nickname 'The Red Planet.' Intriguingly, Mars's atmosphere is very thin, yet this oxidation process still occurred over billions of years.
Photo: Kevin Gill from Los Angeles, CA, United States, Wikimedia Commons, CC BY 2.0.
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The Great Red Spot is an anticyclonic storm, larger than Earth, that has been observed for at least 350 years. Its winds can reach speeds of over 400 miles per hour, and it rotates counter-clockwise. While it has been shrinking over recent decades, it remains a prominent and mysterious feature of Jupiter's turbulent atmosphere.
Photo: Kevin Gill from Los Angeles, CA, United States, Wikimedia Commons, CC BY 2.0.
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Saturn's magnificent rings are not solid structures but are made up of countless small particles, ranging in size from micrometers to meters. These particles are mostly water ice, with a smaller amount of rocky material. If you could gather all the material from Saturn's main rings, it would form a moon only about 100 kilometers across.
Photo: NASA / JPL-Caltech / Space Science Institute, Wikimedia Commons, Public domain.
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Despite Mercury being closer to the Sun, Venus holds the record for the hottest planet. Its incredibly dense atmosphere, primarily carbon dioxide, creates a runaway greenhouse effect, trapping heat and raising surface temperatures to over 460 degrees Celsius (860 degrees Fahrenheit), hot enough to melt lead.
Photo: NASA/JPL-Caltech, Wikimedia Commons, Public domain.
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The most widely accepted theory, known as the Giant Impact Hypothesis, suggests that the Moon formed from the debris ejected into orbit after a colossal collision between early Earth and a Mars-sized protoplanet named Theia. This event is estimated to have occurred about 4.5 billion years ago, just after the Solar System's formation.
Photo: NASA/JPL-Caltech, Wikimedia Commons, Public domain.
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Pluto's reclassification by the International Astronomical Union (IAU) in 2006 sparked much debate. It was demoted because it failed to meet the new criterion of 'clearing its orbit' of other debris, unlike the eight major planets. This decision led to the formal definition of a 'dwarf planet' and the inclusion of other similar bodies.
Photo: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Inst, Wikimedia Commons, Public domain.
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On April 12, 1961, Soviet cosmonaut Yuri Gagarin made history aboard the Vostok 1 spacecraft, becoming the first person to orbit Earth. His groundbreaking flight lasted 108 minutes, marking a pivotal moment in the Space Race and human exploration. Neil Armstrong was the first to walk on the Moon, much later.
Photo: Александр Моклецов / СовИнформБюро, Wikimedia Commons, CC BY 4.0.
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Launched in 1977, Voyager 1 is well beyond the heliopause, venturing into interstellar space. It continues to send back data from over 16 billion miles away, making it the most distant human-made object. Its twin probe, Voyager 2, is also very far, but Voyager 1 is slightly further.
Photo: National Aeronautics and Space Administration (NASA), Wikimedia Commons, Public domain.
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Ceres is unique as both the largest object in the asteroid belt and the only dwarf planet located within the inner Solar System. It's massive enough for its own gravity to have pulled it into a spherical shape. The Dawn spacecraft extensively studied Ceres, revealing a surprisingly active world with potential subsurface water.
Photo: Justin Cowart, Wikimedia Commons, Public domain.
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