WBBSE Class 6 Geography Chapter 1 The Sun The Stars In The Sky Introduction
1. The Sun in the day and numerous points of light including the moon at night, all are known as the celestial bodies.
2. All of the space and everything in it, including millions of stars, planets, galaxies, asteroids, dust, etc, together are known as the universe.
3. The branch of scientific study that concentrates on space and the universe, is known as astronomy. It is one of the oldest practices in science.
4. The cloud of gas and dust in outer space, seen in the night sky as an indistinct bright patch, is called a nebula.
5. A galaxy is a celestial system of millions and trillions of stars, dust, and gas. It is usually spiral or elliptical in shape.
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6. The galaxy in which the Sun, the Earth, and other planets are located, is called the Milky Way.
7. The burning gaseous bodies in space that have their own light and heat are called stars.
8. Light in an airless state has a speed of about 3,000,000 km per second. At this speed, the distance covered in a year is called one light year.
9. constellation is a group of stars that makes an imaginary shape.
10. A planetarium is a dome-shaped theatre in which stars, planets, satellites, and other celestial objects are shown for educational and entertaining purposes.
11. The constellation with seven bright stars that are clearly visible in the summer night sky in the shape of T is called the Ursa Major.
12. The constellation formed by five stars in an ‘M’ or ‘W’ shape, located opposite the Ursa Major, is called the Cassiopeia.
13. The constellation shaped like a cruciform or a flying buck in the night sky is called the Cygnus.
14. The constellation that is clearly visible in the winter sky in the shape of a hunter is called Orion.
15. A bright star in the northern sky is called the Pole star or the Polaris.
16. A tubular instrument used to watch and study distant objects with the help of a combination of mirrors and optic lenses, is called a telescope.
Class 6 Geography WBBSE
17. Observatory is a huge dome-shaped building used to view the sky with the help of a telescope.
18. The Sun is at the center of the solar system and other innumerable heavenly bodies like planets, satellites, asteroids, comets, etc. travel around the Sun.
19. The Sun, the Earth, and other Planets that we know about are parts of a galaxy called the Milky Way. Sun is one of the brightest yellow stars in the Milky way galaxy.
20. The dark spots visible in the interior of the Sun where the temperature is a little lower, are called sunspots.
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21. The outermost surface of the Sun is called Corona.
22. The solar storm is a phenomenon in which plasma, gas, energy, and dust radiate from the Sun at a furious speed due to an explosion on the corona of the Sun.
23. After sunset, one of the brightest celestial bodies is seen in the western sky. It is known as the Evening star. It is also seen in the eastern sky before sunrise. It is known as the Morning star. This is actually the planet Venus.
24. A planet is a stable, dense, heavenly body that does not have its own light and revolves around the Sun in its own specified orbit.
25. Planets that are closest to the Sun are known as the inner planets.
26. Planets that are quite far from the Sun are called outer planets.
27. A dwarf planet is a nearly spherical heavenly body that has a defined orbit but cannot clear any celestial objects in its orbit.
28. Satellites are small, heavenly bodies that orbit around planets.
29. The changes in the shape of the moon from one full moon to a new moon or one new moon to the next are called the phases of the moon.
30. The length of time from one full moon to the immediate next is called a lunar month.
31. Small, rocky celestial bodies that revolve around the Sun on their own specific orbits but are too small to be called planets, are known as asteroids.
32. A luminous celestial body with a burning bright tail is known as a comet.
33. A meteor is the visible part of a meteoroid that enters into the Earth’s atmosphere due to gravitational force. When it comes in a flock to Earth, this phenomenon is known as the meteor shower.
WBBSE Class 6 Geography Universe Notes
Class 6 Geography WBBSE
34. The travel to space by rocket for research purposes is called space travel.
35. Those who travel in space by space shuttle, are known as astronauts.
36. Space suits are clothes specially made to go into space.
37. A rocket is a type of spacecraft that can easily enter space overcoming the effect of Earth’s gravity.
38. The special type of spacecraft used by astronauts to return safely to Earth from space is called a space shuttle.
39. Satellites made by human beings that are sent to space for various purposes are known as artificial satellites.
40. The spacecraft that NASA sent to Mars for research purposes in 2012 is called Curiosity.
41. ISRO is the Indian Space Research Organisation.
42. Aryabhatta is India’s first artificial satellite which had launched on 19 April 1975 from the former Soviet Union.
43. Bhaskara I and Bhaskara II are the two other India’s artificial satellites.
44. INSAT or Indian National Satellite System is a series of artificial satellites of India.
45. India’s first spacecraft that successfully landed on the moon by the initiative of ISRO is called the Chandrayana (2008).
46. The moon is covered by the Earth’s shadow on a full moon night sometimes. Then the moon is not visible from the Earth. This is called the lunar eclipse.
47. On 16 July 1969, the spacecraft sailed from the Kennedy space center in the USA for an expedition to the moon, known as Apollo II.
