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They are used for forecasting weather, transmitting television and radio signals.
They are also used for telecommunication and remote sensing.

Assessment (to be done in the notebook)

1. What is Mangalyaan?
2. Differentiate between the following:
(i) Asteroid and comet
(ii) Meteoroid and comet
3. The gap between the orbit of Mars and Jupiter have
(a) asteroids
(b) comets
(c) meteor
(d) meteorite
4. The Halley’s comet is seen after every
(a) 76 months
(b) 76 years
(c) 56 months
(d) 56 years
5. Which was the first satellite launched by India?
a) Aryabhatta
b) Great Bear
c) Apollo
d) Mangalyaan