so many questions that each of us can ask and which he will find the answer in this book full of exciting details.
Where does the space begin?
- It starts above the atmosphere.
- The higher you raise, the more the air becomes scarce.
- At an altitude of about 160 km it is so tenuous that there is almost nothing left.
- There begins the space.
- Only 160 km above the head.
Is the earth at the center of the universe?
- The universe is everything that exists: all of the planets, their satellites, stars, galaxies, (groups of stars).
- It extends in all directions.
- Perhaps there are parts of the universe that escape our telescopes.
- So we can not say whether or not the earth is at the center of the universe.
this category facts categorized into 10 headings: the universe, the earth, animals, plants, science, the human body, the arts, sports, and a category of general knowledge.