CBSE Class 8 Chapter 17 Stars and the Solar System Revision Notes
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All the objects outside the Earth’s atmosphere are collectively referred to as celestial bodies. The sun and other stars in the sky appear to rise in the east and set in the west because the earth rotates about its axis from west to east. All nine celestial bodies of the solar system shine due to the light they reflect from the sun.
Phases of the moon
The moon completes one rotation on its axis as it completes one revolution around the earth. As the earth and moon go around the sun together, the pattern of day and night on the moon’s surface changes constantly. The amount of illumination on the visible surface of the moon is called the moon’s phase.
Since the moon’s rotation is locked by the gravity of the earth, the same lunar surface always faces the earth. The lunar phase or phase of the moon is described as the shape of the illuminated (sunlit) portion of the moon as seen by an observer on the earth.
There are 8 major phases which have been named and identified:
● New Moon
● Waxing Crescent
● First Quarter
● Waxing Gibbous
● Full Moon
● Waning Gibbous
● Third Quarter or Last Quarter
● Waning Crescent
The sun and the celestial bodies such as planets, comets, asteroids, and meteors which revolve around the sun, form the solar system.
Planets of our solar system:-
● No satellite.
● Closest to the sun.
● Becomes hot when facing the sun.
● Brightest planet in the night sky.
● Called morning or evening star.
● No moon.
● Rotates from east to west.
● It is the only life supporting planet.
● One moon.
● Tilt at the axis is responsible for the change of seasons.
● Appears blue-green from space due to the reflection of light from water and landmass.
● Has an atmosphere.
● So-called red planet.
● Two moons.
● The largest planet.
● Spins rapidly about its axis.
● Has several moons.
● Faint rings around it.
● Least dense among planets.
● Rings around it.
● Large number of moons.
● Highly tilted rotation axis appears to roll on its side.
● Moves from east to west.
● Farthest planet.
● Has a very thin collection of rings.
CBSE Class 8 Chapter 17 Stars and the Solar System Revision Notes PDF