Exercise questions with answers
1. How is it that a star seldom finds another star near it?
Stars are scattered across a vast universe, making them extremely far apart.Most stars travel alone through immense space.Even in a model, stars would be over a million miles apart.This great distance makes encounters between stars very rare.
2. What happened when, according to Sir James Jeans, a wandering star, wandering through space, came near the sun?
About two thousand million years ago, a wandering star came near the sun.Its gravitational pull raised huge tides on the sun’s surface.These tides were far greater than Earth’s ocean tides.They eventually caused part of the sun to break off into space.
3. What happened when the wandering star came nearer and nearer?
As the wandering star approached, it raised a massive mountain of gas on the sun.The mountain grew taller with the star's increasing pull.Eventually, the pull became so strong that the mountain tore apart.Its fragments were thrown into space, becoming the planets.
4. What are planets and how did they come into existence?
Planets are pieces of the sun thrown off by the tidal force of a passing star.These fragments began to revolve around the sun.They gradually cooled and solidified over time.Our Earth is one of these cooled-down planetary pieces.
5. Why is there no life on the stars?
Stars are extremely hot and composed mostly of gases.Their heat is far too intense for life to survive.Solids melt and liquids boil at star temperatures.Thus, life as we know it cannot exist on stars.
6. Write a note on the beginning of life on the earth.
Life began when the Earth cooled enough to support it.It started with simple organisms that could reproduce.Over time, life became more complex and intelligent.Eventually, beings emerged with feelings, ambitions, and beliefs.
7. Why is the universe, of which our earth is a part, so frightening? Give as many reasons as you can.
The universe is frightening due to its immense distances and vast stretches of time.Earth feels extremely small and lonely in comparison.Much of space is either too hot or too cold for life.There is no clear evidence of life like ours anywhere else.
8. What, in your opinion, should be the conditions necessary, for the kind of life we know to exist on other heavenly bodies? Do such conditions generally exist?
Life needs a temperature where liquids can exist and not freeze or boil.It must be neither too far nor too close to a star.Such a narrow "life zone" is rare in space.Even within that, stars seldom form planets at the right distance—only 1 in 100,000 may do so.
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