Summary
Chapter 12 'Beyond Earth' of Class 6 Science (Curiosity) introduces students to stars, constellations, the Solar System, the Moon, asteroids, comets, the Milky Way Galaxy, and the Universe.
This chapter begins with star patterns called constellations, explaining how 88 constellations officially divide the entire sky and how they were historically used for navigation. It then covers the Solar System: the Sun (a star 150 million km away and about 100 times bigger than Earth in diameter), the eight planets in order from the Sun, and their natural satellites. Key topics include Earth's Moon (3,84,000 km away, 27-day revolution, craters formed by asteroid impacts), India's Chandrayaan missions, asteroids in the belt between Mars and Jupiter, comets made of dust-gas-rock-ice, and the Milky Way Galaxy which contains our Solar System. The chapter closes with the search for life on exoplanets and the vastness of the Universe.
Key points & formulas
- 01Constellations are defined sky regions often containing recognisable star patterns; the IAU officially listed 88 constellations.
- 02Star patterns were used for navigation before the magnetic compass; the Pole Star (Polaris/Dhruva tara) appears nearly stationary in the North and helps find direction.
- 03Sirius in Canis Major is the brightest star in the night sky; Orion (the hunter) is best viewed in India from December to April.
- 04The Sun is a star — a hot spherical ball of gases about 100 times bigger than Earth in diameter, located 150 million km (1 au) from Earth.
- 05The eight planets in order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Inner four are small with rocky surfaces; outer four are giant gas-and-ice planets with ring structures.
- 06Venus is called the Morning/Evening Star; Mars is the Red Planet; Earth is the Blue Planet (appears blue from space due to water cover).
- 07The Moon is Earth's natural satellite, about 3,84,000 km away and about 1/4 the size of Earth in diameter, completing one revolution in about 27 days.
- 08Chandrayaan-3 (July 2023) made India the first country to soft-land near the Moon's south pole on 23 August 2023, now celebrated as National Space Day.
- 09Asteroids are small rocky irregular objects; the asteroid belt lies between Mars and Jupiter. Comets are made of dust, gases, rocks and ice and develop a tail when approaching the Sun.
- 10Our Solar System is part of the Milky Way Galaxy (Akasha Ganga), which has millions to billions of stars. There are many galaxies in the Universe beyond our own.
Frequently asked questions
01What is Chapter 12 'Beyond Earth' about in Class 6 Science?
Chapter 12 covers stars and constellations, the Solar System (Sun, eight planets, moons), Earth's Moon and India's Chandrayaan missions, asteroids, comets, and the Milky Way Galaxy. It also introduces the concept of exoplanets and the search for life in the Universe.
02How many constellations are there officially?
The International Astronomical Union (IAU) officially listed 88 constellations in the early twentieth century, dividing the entire sky into 88 regions.
03What is the Pole Star and why is it useful?
The Pole Star (Polaris), part of the Little Dipper (Ursa Minor), appears nearly stationary in the North direction. This helps find North in the Northern hemisphere. In India it is called Dhruva tara. It is not visible from the southern hemisphere.
04What are the eight planets of the Solar System in order from the Sun?
In order of increasing distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. The inner four are smaller with solid rocky surfaces; the outer four are gas and ice giants with ring structures.
05Why is Venus hotter than Mercury even though Venus is farther from the Sun?
Venus has an atmosphere that traps heat, significantly raising its temperature. Mercury, closer to the Sun but with no atmosphere, is actually colder than Venus. The chapter explains that an atmosphere can override the simple distance-from-Sun rule.
06What did Chandrayaan-3 achieve and what is National Space Day?
Chandrayaan-3's Vikram lander (with Pragyan rover) soft-landed near the Moon's south pole on 23 August 2023, making India the first country in the world to achieve this. The Government of India declared 23 August as National Space Day to mark this milestone.
07What is the difference between a planet and a dwarf planet? Why is Pluto not a planet?
In 2006, the IAU redefined the requirements for a planet. Pluto (smaller than Earth's Moon) did not meet the new definition after similar small objects were found beyond Neptune. Pluto and these similar objects are now classified as dwarf planets.
08Why does a comet develop a tail only near the Sun?
Comets are made of dust, gases, rocks and ice. When a comet approaches the Sun, the frozen material heats up and evaporates, forming the long visible tail. As the comet moves away, evaporation decreases, the comet dims and the tail fades.
09What is the Milky Way Galaxy and what is our Solar System's place in it?
The Milky Way Galaxy (Akasha Ganga) is our home galaxy, containing millions to billions of stars. Our entire Solar System — the Sun, eight planets, their moons, asteroids and comets — is just one small part of this vast galaxy.
10What are exoplanets and has life been found on any of them?
Exoplanets are planets revolving around other stars in our galaxy. Scientists search them for signs of life. Till now, no evidence of life has been found anywhere beyond Earth, but the search continues.
11Can I download the Class 6 Science Chapter 12 'Beyond Earth' PDF for free?
Yes — the NCERT Class 6 Science (Curiosity) Chapter 12 PDF is available free of charge on cbseprepmaster.com with no sign-up required.
More chapters in Curiosity
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