The Hardest Space Quiz: Questions And Answers
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Which planet has the largest rings in our solar system?
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Saturn
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Venus
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Jupiter
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Mars
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This Hard Space Quiz will test your knowledge about the mysteries of the universe. This quiz focuses on hard questions about space with answers that challenge your understanding of space exploration, celestial bodies, and the vast universe that surrounds us. If you are a student or just curious about the cosmos, this quiz will push your limits and deepen your See moreknowledge of complex astronomical concepts.
Each question has been carefully designed to challenge your grasp of topics like black holes, the solar system, and space missions. The answers provided after each question will help clarify key concepts and offer additional insights into the subject matter. This quiz is perfect for those looking to strengthen their understanding of space science and test their intellectual limits.
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- 2.
Which exoplanet was discovered in 2016?
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Mars
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Planet Y
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Planet X
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Proxima Centauri b
Correct Answer
A. Proxima Centauri bExplanation
In 2016, the exoplanet Proxima Centauri b was discovered orbiting Proxima Centauri, the closest star to the Sun. This Earth-sized planet is located in the star's habitable zone, where liquid water could potentially exist. Its proximity to Earth and its location in the habitable zone make it a key target for studies on the potential for extraterrestrial life. The planet was detected using the radial velocity method, which measures the star's wobble caused by the planet's gravitational pull.Rate this question:
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- 3.
What planet is the furthest from Neptune?
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Saturn
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Mercury
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Mars
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Uranus
Correct Answer
A. MercuryExplanation
Mercury is the planet that is furthest from Neptune. In the solar system, the planets are arranged in the following order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Since Neptune is the eighth planet from the Sun and Mercury is the first, they are at opposite ends of the planetary lineup, making Mercury the furthest from Neptune.Rate this question:
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- 4.
Which of the following phenomena is responsible for the extreme tilt of Uranus’ axis, causing it to rotate on its side compared to most other planets in the solar system?
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A giant impact with an Earth-sized object during its formation.
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Gravitational interactions with Neptune over millions of years.
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A strong magnetic field that altered its rotational axis.
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Tidal forces from its moons pulling it off balance.
Correct Answer
A. A giant impact with an Earth-sized object during its formation.Explanation
Uranus’ extreme axial tilt, which causes it to rotate on its side, is believed to be the result of a massive collision with an Earth-sized object early in its formation. This impact likely knocked the planet over, giving it a tilt of about 98 degrees. As a result, Uranus experiences extreme seasonal variations, with each pole spending about 42 years in continuous sunlight or darkness as it orbits the Sun.Rate this question:
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- 5.
Which of the following is not a planet in our solar system?
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Venus
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Neptune
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Jupiter
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Io
Correct Answer
A. IoExplanation
Io is one of the moons of Jupiter and not a planet. Venus and Neptune are planets in our solar system. Pluto was once considered the ninth planet but was reclassified as a dwarf planet by the International Astronomical Union in 2006. Hence, Io is the correct answer as it is not a planet.Rate this question:
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- 6.
What is the hottest planet in the solar system?
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Mercury
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Venus
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Mars
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Jupiter
Correct Answer
A. VenusExplanation
Venus is the hottest planet in our solar system. Despite not being the closest to the Sun (that's Mercury), Venus has a thick atmosphere made mostly of carbon dioxide, which traps heat from the Sun. This phenomenon creates a runaway greenhouse effect, making Venus hotter than Mercury, which lacks a substantial atmosphere to retain heat. Surface temperatures on Venus can reach up to 470 degrees Celsius (880 degrees Fahrenheit), making it the hottest planet in our solar system, hotter even than Mercury, Mars, and Jupiter.Rate this question:
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- 7.
Which planet is also called "The Diamond Planet"?
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Kepler-10b
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Gliese 436 b
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55 Cancri e
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HD 219134 b
Correct Answer
A. 55 Cancri eExplanation
55 Cancri e is often called "The Diamond Planet." This nickname comes from scientists' belief that the planet might have a carbon-rich composition. Under high pressure, carbon can form diamonds, leading to the idea that 55 Cancri e could have a surface or interior with a significant amount of diamond. This exoplanet is located about 41 light-years away from Earth in the constellation Cancer. Its unique composition and proximity to its star make it an interesting subject for study, distinguishing it from other planets like Kepler-10b, Gliese 436 b, and HD 219134 b.Rate this question:
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- 8.
Which planet in our solar system does not have a moon?
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Mars
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Venus
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Jupiter
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Earth
Correct Answer
A. VenusExplanation
Venus is one of the two planets in our solar system that does not have any moons, the other being Mercury. Unlike other planets that have one or more natural satellites, Venus and Mercury lack such companions. Scientists believe that the reasons might include their proximity to the Sun, which creates strong gravitational forces that make it difficult for these planets to capture and retain moons.Rate this question:
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- 9.
How many moons does Saturn have?
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40
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85
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146
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22
Correct Answer
A. 146Explanation
Saturn has 146 known moons, making it the planet with the most moons in our solar system. These moons vary greatly in size and characteristics, ranging from small moonlets only a few kilometers across to large moons like Titan, which is larger than the planet Mercury. Saturn's moons are diverse and include icy bodies, rocky satellites, and even moons with substantial atmospheres. The large number of moons contributes to the complex and fascinating nature of the Saturnian system.Rate this question:
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- 10.
Which planet is known as the "Red Planet"?
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Jupiter
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Mars
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Saturn
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Neptune
Correct Answer
A. MarsExplanation
Mars is commonly referred to as the "Red Planet" due to its reddish appearance, which is caused by iron oxide, or rust, on its surface. This distinctive color can be seen even with the naked eye from Earth. Mars has been a focus of scientific exploration because of its potential to have once supported life. It has the largest volcano in the solar system, Olympus Mons, and a canyon system called Valles Marineris. The planet's thin atmosphere, composed mostly of carbon dioxide, and its surface conditions make it a challenging environment for human habitation.Rate this question:
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- 11.
What is the smallest planet in our solar system?
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Earth
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Mars
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Mercury
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Venus
Correct Answer
A. MercuryExplanation
Mercury is the smallest planet in our solar system. It has a diameter of about 4,880 kilometers, which is roughly one-third the size of Earth. Mercury is the closest planet to the Sun and has a very thin atmosphere, leading to extreme temperature variations between day and night. Despite its small size, Mercury has a large iron core, which makes up a significant portion of its mass. Its surface is covered with craters, similar to our Moon, due to numerous impacts from asteroids and comets.Rate this question:
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- 12.
What is the most distant planet in our solar system?
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Uranus
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Neptune
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Pluto
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Mars
Correct Answer
A. NeptuneExplanation
Neptune is the most distant planet in our solar system. It lies 4.5 billion kilometers from the Sun, beyond Uranus. Though Pluto was once considered the most distant, its elliptical orbit has it crossing the orbit of Neptune. Neptune is the eighth planet from the Sun, and it has a thick atmosphere, predominantly composed of hydrogen, helium, and methane, which gives it its blue color. The planet is known for its strong winds, reaching speeds of 2,100 kilometers per hour, and its Great Dark Spot, which is similar to Jupiter's Great Red Spot.Rate this question:
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- 13.
Which moon is the largest natural satellite in our solar system?
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Ganymede
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Io
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Titan
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Europa
Correct Answer
A. GanymedeExplanation
Ganymede is the largest moon in our solar system, even bigger than the planet Mercury. It has a diameter of 5,268 kilometers and is primarily made of water ice and silicate rock. Ganymede orbits Jupiter and is part of the Galilean moons, discovered by Galileo. It has a magnetic field, making it unique among moons, and scientists believe it has a subsurface ocean beneath its icy crust. This feature could harbor conditions suitable for life, making Ganymede a significant target for future exploration missions.Rate this question:
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- 14.
Which planet is known as "The Morning Star"?
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Venus
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Mercury
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Mars
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Saturn
Correct Answer
A. VenusExplanation
Venus is known as "The Morning Star" due to its appearance in the sky before sunrise. Venus orbits closer to the Sun than Earth, and its highly reflective cloud cover makes it the third-brightest object in the sky, after the Sun and the Moon. It has a thick, toxic atmosphere filled with carbon dioxide, contributing to its extreme greenhouse effect and making Venus the hottest planet in our solar system. Its orbit and reflective properties cause it to appear bright, earning its nickname as the "Morning Star."Rate this question:
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- 15.
What is the primary component of the Sun?
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Oxygen
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Helium
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Hydrogen
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Carbon
Correct Answer
A. HydrogenExplanation
Hydrogen is the primary component of the Sun, making up about 75% of its mass. In the Sun's core, hydrogen undergoes nuclear fusion, transforming into helium while releasing immense energy in the form of light and heat. This process powers the Sun and other stars. The Sun's fusion rate is about 600 million tons of hydrogen every second. Hydrogen's abundance in the Sun is crucial for sustaining its energy output over billions of years, providing the warmth and light necessary for life on Earth.Rate this question:
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- 16.
Which galaxy is closest to the Milky Way?
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Andromeda Galaxy
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Triangulum Galaxy
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Whirlpool Galaxy
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Messier 87
Correct Answer
A. Andromeda GalaxyExplanation
Andromeda Galaxy is the closest spiral galaxy to the Milky Way, located about 2.537 million light-years from Earth. It has more than a trillion stars, significantly more than the Milky Way. The two galaxies are on a collision course and are expected to merge in about 4.5 billion years, forming a new elliptical galaxy. The Andromeda Galaxy is visible to the naked eye from Earth, especially in the Northern Hemisphere during the fall and winter months, making it one of the most studied galaxies in our cosmic neighborhood.Rate this question:
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- 17.
How many planets in our solar system have rings?
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2
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4
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6
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1
Correct Answer
A. 4Explanation
Four planets in our solar system have rings: Jupiter, Saturn, Uranus, and Neptune. These planetary rings are made of small particles, ice, and dust, ranging in size from microscopic grains to large chunks. Saturn’s rings are the most prominent, while those of the other planets are less visible and more faint. The existence of these rings is due to the planets’ strong gravitational forces, which capture debris from nearby moons, asteroids, or comets. Saturn’s rings, made up of icy particles, are the most studied due to their size and visibility.Rate this question:
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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
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Current Version
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Mar 10, 2025Quiz Edited by
ProProfs Editorial Team -
Jun 26, 2009Quiz Created by
Year7
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