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प्रश्न
Distinguish between the following pair.
Periodical and Non-periodical comets
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उत्तर
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.
संबंधित प्रश्न
Study the picture and answer the questions that follow.
(a) What does the picture show you about the earth?
(b) State briefly the Bedford Level Experiment.
(c) The sun rises and sets at different times in different places. What does the statement show the shape of the earth?
(d) In what way is the earth’s atmosphere beneficial to mankind?
Name the planet farthest from the Sun.
Give a reason for the following:
Earth is called a “Watery Planet”
What makes our Sun as an ordinary star in the universe?
Distinguish between the following pair.
Planet and Planetoids
Give reasons for the following:
No life is possible on Saturn.
What is meant by Summer Solstice?
Answer the following question briefly.
How does a planet differ from a star?
The continent full of snow is ________.
How many continents are there on the earth?
