Advertisements
Advertisements
Question
Distinguish between the following pair.
Periodical and Non-periodical comets
Advertisements
Solution
Periodical comets: The comets which have regular orbits around the Sun and occur at fixed intervals are called periodical comets. Halley’s comet is a periodical comet and is one of the most famous comets, which is due next in 2062. It is seen at intervals of 76 years. It was seen in 1910 and in 1986.
Non-periodical comets: Such comets are seen very rarely and they are not sighted at regular intervals. There are records of observations of about 1000 comets. Some of these have been named. Comets become visible only when they travel close to the Sun. The ice melts and the gas and dust are swept back to form the tail. The tail always points away from the Sun.
RELATED QUESTIONS
Short Answer Question:
What is meant by Inner Planets? Name them.
Study the picture and answer the questions that follow.
(a) What is meant by the Solar System?
(b) Give two differences between a planet and a star.
(c) Name the planets known as terrestrial planets.
(d) Give two advantages the earth has over other planets.
(e) What are satellites?
Why do planets, being opaque bodies, shine in the sky?
Give reasons for the following:
Pluto is the coldest planet.
The shape of the earth is not exactly that of a sphere Why?
From which Greek word is the word ‘planet’ derived?
Who am I?
I have my own light. It is only from me that the planets get light and heat.
For what purpose are rockets used in space travel?
The Earth is the _______ planet from the sun.
The Tropic of Cancer faces the Sun directly on ______.
