Objects in the Solar System
Objects in the Solar system: (i) Asteroids Asteroids are small heavenly bodies which orbit round the Sun between the orbits of Mars and Jupiter. They…
Physics
Atmosphere in the Planets
The ratio of the amount of solar energy reflected by the planet to that incident on it is known as albedo. From the knowledge of…
Conditions for Life on any Planet
The following conditions must hold for plant life and animal life to exist on any planet: (i) The planet must have a suitable living temperature…
Mass of Planets and Sun
In the universe one heavenly body revolves around another massive heavenly body (The Earth revolves around the Sun and the moon revolves around the Earth).…
Surface Temperatures of the Planets
The planets do not emit light of their own. They reflect the Sun’s light that falls on them. Only a fraction of the solar radiation…
Kepler’s Laws of Planetary Motion
Kepler’s laws of planetary motion (i) The law of orbits Each planet moves in an elliptical orbit with the Sun at one focus. A is…
Planetary Motion
The ancient astronomers contributed a great deal by identifying the planets in the solar system and carefully plotting the variations in their positions of the…
Solar System of Universe
The part of the universe in which the Sun occupies the central position of the system holding together all the heavenly bodies such as planets,…
Launching a Satellite
To place a satellite at a height of 300 km, the launching velocity should at least be about 8.5 km s-1 or 30600 kmph If…
Principle of Rockets
A rocket is a vehicle which propels itself by ejecting a part of its mass. Rockets are used to carry the payloads (satellites). We have…
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