E. Answer the following questions briefly.
1. Define universe.
4. Why is the Earth called a geoid?
6. Why does Neptune appear blue in colour?
2. What are constellations? Give few examples.
3. List three differences between planets and stars.
5. What is the difference between the inner and the outer planets in the Solar System?
Answers
Explanation:
1.all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.
4.The geoid is a shape like the surface of the Earth. For many practical purposes, a simpler shape is used because that makes calculations easier. That shape is called a reference ellipsoid. In basic education, the shape of the Earth is described as being like an orange, a sphere but wider round the equator.
6.Its atmosphere is made of hydrogen, helium, and methane. The methane gives Neptune the same blue color as Uranus.
2.A constellation is a group of stars which make up imaginary outline or pattern in the night sky. The word constellation comes from Latin: con-, meaning together and stella- meaning stars. Some examples of constellations are Ursa Major, Orion, and Andromeda.
3.The celestial object that has a fixed path (orbit), in which it moves around the star, are known as Planets. Stars have their own light, whereas planets do not have their own light, they reflect the sunlight that falls on the planets. ... The temperature of a star is very high, while that of a planet is low.
5.Mercury, Venus, Earth, and Mars are the planets closest to the Sun. They are called the inner planets. The inner planets are made up mostly of rock. The outer planets are Jupiter, Saturn, Uranus, and Neptune.