Questions
1. Write a short note on the formation of the universe.
2. What are satellites?
3. Which is the most famous comet? What is special about it?
4. What are meteorites?
C. Long Answer Questions
Answers
Explanation:
1) Before Hubble, most astronomers thought that the universe didn’t change. But if the universe is expanding, what does that say about where it was in the past? If the universe is expa7nding, the next logical thought is that in the past it had to have been smaller.
The Big Bang Theory
The Big Bang theory is the most widely accepted cosmological explanation of how the universe formed. If we start at the present and go back into the past, the universe is contracting, getting smaller and smaller. What is the end result of a contracting universe? According to the Big Bang theory, the universe began about 13.7 billion years ago. Everything that is now in the universe was squeezed into a very small volume. Imagine all of the known universe in a single, hot, chaotic mass. An enormous explosion—a big bang—caused the universe to start expanding rapidly. All the matter and energy in the universe, and even space itself, came out of this explosion. What came before the Big Bang? There is no way for scientists to know since there is no remaining evidence.
2) a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such as Earth's Moon.
3) Comet Halley is perhaps the most famous comet in history. It was named after British astronomer Edmund Halley, who calculated its orbit. He determined that the comets seen in 1531 and 1607 were the same objects that followed a 76-year orbit. Unfortunately, Halley died in 1742, never living to see his prediction
4) a piece of rock or metal that has fallen to the earth's surface from outer space as a meteor. Over 90 per cent of meteorites are of rock while the remainder consist wholly or partly of iron and nickel.
it took so much time to type........
2. the celestial body orbiting the earth or another planet like moon is the satellite of earth as its orbitind the earth
3. Haleys Comet is the famous comet. As its a periodic comet.
4. Meteorites are the solid piece of debris from an object such as comet asteriod or meteoroid. hope this will help you