Science · Class 6 · Chapter 12

Beyond Earth

Aim: Build a clear, working understanding of this chapter's key ideas, connected to real NCERT examples, worked problems, and everyday situations.
  • Constellation — A region of sky with a recognizable star pattern.
  • Planet — A large, near-spherical object orbiting the Sun.
  • Satellite / Moon — An object orbiting a larger one; Earth's natural satellite.
  • Asteroid — A small, rocky object orbiting the Sun.
  • Comet — An icy object with a long tail, orbiting the Sun.
  • Galaxy — A huge collection of stars — ours is the Milky Way.
  • Revolution / Rotation — Orbiting a body / spinning on one's own axis.
  • Light pollution — Artificial light that hides stars from view.
40 min lesson

Chapter 12 · Concept 1 of 8

Stars and Constellations

  • Ancient people saw patterns of stars as shapes of animals, objects, or characters from stories — useful for navigation before the compass.
  • Orion the Hunter — Three stars form his belt. Nearby Canis Major (his dog) holds Sirius, the brightest star in the night sky.
  • The Pole Star — Found using the Big Dipper (Ursa Major, called Saptarishi in India). It appears almost stationary in the north, helping travellers find direction.

Chapter 12 · Concept 2 of 8

Watching the Night Sky

  • Light pollution — Excessive artificial light and smoke or dust reduce the number of visible stars, especially in cities.
  • Sky-mapping apps — Apps like Sky Map and Stellarium help identify stars, constellations, and planets from wherever you're standing.

Chapter 12 · Concept 3 of 8

The Sun Is a Star

  • An extremely hot, spherical ball of gases that gives out huge amounts of energy — that's what makes it glow.
  • Why it looks so much bigger — The Sun is only about 100 times bigger than Earth — but it looks so much brighter than other stars simply because it's far closer to us (about 150 million km away).

Chapter 12 · Concept 4 of 8

Inner (Rocky) and Outer (Gas Giant) Planets

  • Inner planets — Mercury, Venus, Earth, Mars — smaller, with solid rocky surfaces.
  • Outer planets — Jupiter, Saturn, Uranus, Neptune — much larger, made mostly of gas and ice, with ring-like structures.

Chapter 12 · Concept 5 of 8

Venus, Mars, and Earth

  • Planet | Nickname | Why
  • Venus — Morning / Evening Star — Bright and visible near sunrise or sunset (though not actually a star)
  • Mars — The Red Planet — Its soil has a reddish colour
  • Earth — The Blue Planet — Most of its surface is covered by water

Chapter 12 · Concept 6 of 8

The Moon and India's Chandrayaan Missions

  • The Moon — Earth's natural satellite, taking about 27 days to revolve around Earth. Its many craters, formed by impacts, are preserved because it has no atmosphere.
  • Chandrayaan-3 — Achieved a soft landing near the Moon's south pole on 23 August 2023 — now celebrated every year as National Space Day.

Chapter 12 · Concept 7 of 8

Asteroids and Comets

  • Asteroids — Small, rocky, irregularly shaped objects that orbit the Sun, mostly found in the asteroid belt between Mars and Jupiter.
  • Comets — Icy, dusty objects with long tails, visible when close to the Sun. Halley's Comet appears every 76 years — it was last seen in 1986.

Chapter 12 · Concept 8 of 8

The Milky Way and the Universe

  • Solar System — The Sun, planets, moons, asteroids, and comets that orbit the Sun.
  • Milky Way Galaxy — Our home galaxy (Akasha Ganga) — billions of stars, including the Sun.
  • The Universe — Everything that exists — including countless galaxies beyond our own.

Quick Recap

Check Your Understanding

  1. 1Match: (i) Satellite of Earth (ii) Red planet (iii) Constellation (iv) Planet called an evening star — with (a) Orion (b) Venus (c) Mars (d) Moon.
  2. 2Solve the riddle: my letters come from MAN (not CAN), ACE and FAN, RAT (not CAT), and SUN (not FUN). I am a planet that moves around the Sun. Then make two riddles of your own.
  3. 3Which of these is NOT a member of our Solar System? (i) Sirius (ii) Comets (iii) Asteroids (iv) Pluto