Stars and Solar System

Q43. Which constellation appears to have the shape of a big ladle or a question mark?

Ans. Ursa Major is the constellation appears to have the shape of a big ladle or a question mark.

Q44. What are the celestial objects that we can see in the sky?

Ans. The stars, the planets, the moon and many other objects in the sky are called celestial objects.

Q45. What is full moon?

Ans. The day on which the whole disc of the moon is visible is known as the full moon day.

Q46. Which is the brightest star in the sky?

Ans. The star Sirius is the brightest star in the sky. It is located close to Orion.

Q47. What are 'celestial objects'?

Ans. The stars, the planets, the moon and many other objects in the sky are called celestial objects.

Q48. Which planet has a well-developed system of rings around it?

Ans. Saturn has a well-developed system of rings around it. These rings are not visible with the naked eye.

Q49. Which star always remains in the same position in the sky in the north?

Ans. The pole star is the star which remains in the same position in the sky in the north.

Q50. Which unit is used to measure the distance between celestial bodies?

Ans. Light year is the unit used to measure the distance between the various celestial bodies.

Q51. What causes day and night on earth?

Ans. The change between day and night is caused by the rotation of the Earth on its axis.

Q52. What time of year is the constellation Orion visible?

Ans. Orion is well-known constellation that can be seen during winter in the late evenings.

Q53. How will our Earth look when seen from a space and why?

Ans. From space, the Earth appears blue-green due to the reflection of light from water and landmass on its surface.

Q54. What causes the change in seasons?

Ans. The axis of rotation of the Earth is not perpendicular to the plane of its orbit. The tilt is responsible for the change of seasons on the Earth.

Q55. What is meteorite?

Ans. Some meteors are large so that they can reach the Earth before they evaporate completely. The body that reaches the Earth is called a meteorite.

Q56. Who landed on the moon for the first time?

Ans. On July 21, 1969 (Indian time), the American astronaut Neil Armstrong landed on the moon for the first time followed by Edwin Aldrin.

Q57. Why are stars not visible during the daytime?

Ans. In fact, the stars are present in the sky during the day-time also. However, they are not visible then because of the bright sunlight.

Q58. Why the Sun appears to rise in the east and set in the west?

Ans. The Sun appears to rise in the east and set in the west because the Earth rotates from west to east on its axis.

Q59. Which is the star nearest to the Earth?

Ans. The Sun is the star nearest to the Earth. It is nearly 150,000,000 kilometres (150 million km) away from the Earth.

Q60. Why does Pole Star appear to be stationary in the sky?

Ans. The pole star appears to be stationary from the Earth, because it is situated close to the direction of the axis of rotation of the Earth.