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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?
How many satellites are there in Solar System?
Which is the center of the Solar System-Sun or Earth?
Distinguish between the following pair.
Planet and Planetoids
Give reasons for the following:
Pluto is the coldest planet.
‘Venus is considered Earth’s Twin’. Why?
Who am I?
I have my own light. It is only from me that the planets get light and heat.
Which of the statement(s) is/are true?
Statement I: Earth is called a watery planet.
Statement II: The rotation of the Earth causes seasons.
The continent _____________ is covered by ice.
Only ______ percent of water is fresh on earth.
