E.
Give short answers for the following questions. (20-30 words)
1. What is a constellation?
2. Why can't some stars be seen with the naked eye?
3. Name the constituents of the universe.
4. What according to you makes Earth an unique planet?
5. What is a satellite?
Answers
1) Constellation is a group of stars which make up imaginary outline or pattern in the night sky (the celestial sphere).
2)It's because of distance between the star and earth is too much that light from is scattered and is very faintly visible and also this depends on the size and the age of the star. The size determines how big it is and whether it shines brighter than other stars or not and also the age determines the amount of fuel left in stars for it's continuous fusion to occur.
3)The Universe is thought to consist of three types of substance: normal matter, 'dark matter' and 'dark energy'.
4)Earth has a very hospitable temperature and mix of chemicals that have made life possible here. Most notably, Earth is unique in that most of our planet is covered in water, since the temperature allows liquid water to exist for extended periods of time.
5)A satellite is a small object that orbits, or revolves around, a larger object in space. Satellites can be natural or artificial (made by people).Artificial satellites are sent into space to gather information. Most are launched into space by rockets.