(a) In which direction do stars appear to move in the sky?
(b) Why do they appear to move in this direction?
(a) The stars appear to move in the sky from east to west direction.
(b) Stars move in a direction opposite to the rotation of Earth. Rotation of Earth is from west ro east direction on it's axis. Therefore, stars move from east to west.
What are the phases of the Moon? Explain with the help of diagram.
Moon has no light of its own. It reflects light of the sun falling on it. On new moon day, moon is between the sun and the earth and no reflected light from it reaches the earth. We cannot see moon on that day. The visible moon increases every day till fifteenth day from the new moon day, the full phase of the moon is visible.
So, the waxing and waning of moon periodically as it revolves around the earth is. called phases of moon.
Why do stars appear to us like points, whereas sun looks bigger?
Sun is located closer to the earth as compared to stars. Stars are million times farther away than the sun. Therefore, stars appear to us like points and Sun appears bigger.
What is solar system? Name the planets situated between the sun and the earth.
The Solar system consists of the Sun and the celestial bodies which revolve around the Sun. Added to that it consists of a large number of bodies such as planets, comets, asteroids and meteors. The sun is the centre of the solar system and all the planets revolve around the sun in elliptical paths called orbits.
The planets situated between the sun and the earth are Mercury and Venus.
X is a group of stars which is visible during the summer season in the early part of the night. It can be seen clearly in the month of April in the northern part of the sky. It resembles a bowl with a handle. It also resembles a big kite with a tail.
(a) What is the general name of groups of stars like X?
(b) Write any two names of X.
(c) Is it a part of our solar system?
(d) How many bright stars are usually observed in X?
(e) Which famous star can be located in the sky with the help of X?
(a) Constellations.
(b) Ursa major, Great bear.
(c) No. Constellations are made up from other stars. So, it is not a part of our solar system.They are a part of our galaxy.
(d) Seven to eight bright stars are usually observed in a constellation.
(e) Pole Star can be located in the sky.
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