Page 154 - Innovator's Science-8

play a crucial role in modern life – helping in communication, navigation,
weather monitoring, disaster management, and scientific research. In

India, the Indian Space Research Organisation (ISRO) has designed and
Science launched many satellites to perform these important functions.
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Testimony
The Cartosat series of satellites, launched by ISRO, take clear and detailed pictures of Earth to help make be er maps, plan ci es, and
manage natural disasters in India. One pla orm called Bhuvan uses these images to show things like land shape, soil, how land is
used, and plant growth. AstroSat, another ISRO mission, studies stars and other objects
in space. India has also sent missions like
Chandrayaan 1, 2, and 3 to the Moon; Aditya
L1 to study the Sun; and Mangalyaan to
explore Mars. ISRO encourages Indian
students to build and launch small satellites
as well, including AzaadiSat, InspireSat-1,
and Jugnu.
Astrosat
Cartosat

Activity-3 Aim: to observe the movement of an ar ficial satellite, in the night sky and
understand how it differs from stars or planets.
Experiential Learning
Procedure :

Choose a safe open area with a clean view of the sky, away from trees and tall
buildings.
Science • Just before sunrise or a er sunset, go to a loca on, accompanied by an adult.
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• To iden fy satellites in the sky, look for any moving object in the sky that appears
as a point of light with steady or flickering brightness and is moving very fast
Testimony
Vikram Ambalal Sarabhai across the sky.
(1919–1971) Vikram • You can view it with the naked eye or with binoculars.
Sarabhai, a researcher in
space science and nuclear • To make it easier, use mobile apps or astronomy websites that show w3hen
physics is known as the satellites will pass over your loca on.
Father of the Indian
Space programme. He Many countries send artificial satellites into space for different uses. After
pioneered the effort to these satellites and their rocket parts finish working, they become space
launch the first ar ficial
satellites. The Vikram junk, also called space debris. This debris fills up space and can bump into
Sarabhai Space Centre working satellites, causing damage. Small pieces of debris usually burn up
(VSSC), located in
Thiruvananthapuram, the in Earth's atmosphere when they fall back, but bigger pieces can reach the
ISRO centre that develops ground and crash. To keep space safe, countries are now working together
rockets.
to find ways to remove this dangerous space debris.The Sun appears to rise
in the east and set in the west every day because the Earth rotates around

its axis. This rotation causes the Sun to seem to move across the sky in a
regular cycle, which is the basis of a day. The time it takes for the Sun to go
from its highest point in the sky one day to the same point the next day is
about 24 hours, called the mean solar day. We can tell when the Sun is
highest by the shortest shadow an object casts during the day.

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