GK Notes On Solar System (Part-2)

GK Notes On Solar System (Part-2)

Dear Readers, here we are giving important notes on solar System for exams like Railways RRB, SSC CGL, SBI PO, SBI Clerk, IBPS Clerk, and IBPS PO. So understand the basics of the Solar System in these GK Notes.

5. Jupiter

  • Largest planet of the solar system.
  • Has the shortest rotation period.
  • Has a faint ring around it.
  • Has 67 moons.
  • 4 largest moons discovered by Galileo – Ganymede (largest moon in the solar system – bigger than Mercury), Callisto, Io (volcanic), Europa (has water-ice).

6. Saturn

  • Second largest planet in the Solar system.
  • Its density is less than the water.
  • Has a band of concentric rings revolving around it made up of tiny rocks and pieces of ice.
  • Has 62 moons.
  • Moons of Saturn: Titan is the largest , Rhea , Enceladus.

7. Uranus

  • Third biggest planet of the solar system.
  • Composed of Hydrogen, Helium, Water, Ammonia, Methane.
  • Has faint rings.
  • Has 27 known moons.

8. Neptune

  • Farthest planet from the Sun.
  • Primarily composed of hydrogen, helium, nitrogen, water, ammonia, methane.
  • Is blue in colour because of methane.
  • Has a storm called ‘Great Dark Spot’.
  • Has 14 known moons (Triton – largest)


  • Used to be the ninth planet.
  • Demoted to status of “Dwarf Planet”.
  • Icy and cold.
  • Has five moons – Charon, Styx, Nix, Kerberos, Hydra.


  • Tiny icy and rocky bodies that travel in highly elliptical orbits around the sun.
  • When they pass close to the sun, they water and gases heat up.
  • This leads to the formation of a tail behind the rocky core in the direction opposite to the sun.
  • Most famous comet is Halley’s Comet which reappears every 75-76 years.


  • Meteoroids are formed due to the collisions between asteroids.
  • They are fragments of rocks floating about in space.
  • Most of these meteors can’t reach earth’s surface and burn up in the atmosphere due to the friction with air.
  • The meteors that do reach the earth’s surface are known as meteorites.


  • Almost like planets but smaller in size.
  • Not spherical in appearance.
  • Revolve around the Sun.
  • Most of them are found in a belt between Mars and Jupiter.
  • The largest asteroid in the Asteroid Belt is Ceres.

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