Key Concepts & Self-Assessment15 Key Facts
Review key Solar System exam facts and rate your mastery to track revision.
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#1
The Sun accounts for approximately 99.86% of all mass in the Solar System.
#2
Jupiter is the largest planet by both diameter and mass, and hosts Ganymede, the largest moon in the Solar System.
#3
Venus has the highest mean surface temperature (approx 465°C) due to a runaway carbon dioxide greenhouse effect.
#4
The Asteroid Belt lies between the orbits of Mars and Jupiter, containing minor planets including the dwarf planet Ceres.
#5
Saturn possesses the most extensive ring system, primarily composed of water ice particles with trace silicate dust.
#6
The Kuiper Belt extends from Neptune’s orbit (30 AU) to approximately 50 AU from the Sun.
#7
Mercury has no substantial atmosphere and completes an orbit around the Sun in just 88 Earth days, possessing the highest orbital velocity of roughly 47 km/s in the Solar System.
#8
Mars has an orbital period of 687 Earth days and hosts Olympus Mons, a shield volcano rising 21.9 km above the Martian datum, making it the tallest planetary volcano.
#9
The Oort Cloud is a theoretical spherical shell of icy planetesimals extending from 2,000 AU out to approximately 100,000 AU, acting as the reservoir for long-period comets.
#10
Uranus has an extreme axial tilt of 97.77 degrees, resulting in a retrograde rotation almost parallel to its orbital plane and severe 42-year polar seasonal extremes.
#11
Neptune exhibits the fastest sustained wind speeds in the Solar System, exceeding 2,100 km/h, and hosts Triton, the only large planetary moon with a retrograde orbit.
#12
The Sun generates energy via the proton-proton chain nuclear fusion reaction in its core at approximately 15 million Kelvin, converting 600 million metric tons of hydrogen into helium each second.
#13
The Roche limit defines the minimum orbital distance at which a celestial body held together only by its own gravity can approach a primary body without disintegrating from tidal forces.
#14
The Heliopause marks the outer boundary where the supersonic solar wind is balanced by the incoming interstellar medium, located at roughly 120 AU and crossed by Voyager 1 in 2012.
#15
Kepler's Third Law of planetary motion states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
Subject Specialist Commentary
Analytical perspective & practical exam advice from the Master10 academic board
The solar system consists of the Sun and every celestial body bound to it by gravity, including eight planets, dwarf planets, and millions of asteroids and comets. The Sun holds about 99.86 percent of the total mass. The four inner rocky planets are separated from the outer gas and ice giants by the Asteroid Belt between Mars and Jupiter. Beyond Neptune lies the icy Kuiper Belt.
In competitive exams like SSC and UPSC Prelims, examiners frequently set traps around planetary extremes. Remember that Venus, not Mercury, is the hottest planet because of its dense carbon dioxide greenhouse atmosphere. Also note that Uranus has extreme axial tilt and rotates backwards. A classic question trap confuses Ganymede as a moon of Saturn instead of Jupiter. For quick memory revision, recall the order of planets from the Sun using the phrase: "My Very Educated Mother Just Served Us Noodles."
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