Objects in space, such as planets, moons,
asteroids and stars are called celestial
bodies or heavenly
bodies.
Satellite is an object that revolves around the planet. There are two types of satellites,
There are two types of satellites, A celestial body that revolves around a planet
is known as natural satellite. Like .
üNatural
satellites: A celestial body that revolves around a planet
is known as natural satellite. Like Earth’s moon.
üArtificial
satellites: An object launched into orbit by human beings
is called an artificial satellite.
The first
artificial satellite was launched in 1957.
Asteroids are small rocky bodies that are members of solar
system.
Asteroids move in elliptical orbits between Mars and
Jupiter.
There are about 100,000 asteroids; only two
named Ceres and Vesta can be seen from the earth without
telescope.
Ceres is the largest
asteroid ever discovered. Its diameter is about 933km.
Comet (
Comet (دُم دار تارا) is relativity
small, icy celestial body revolving around the Sun. It has luminous
tail.
A Comet has three parts; ahead, coma and
tail.
A Comet has three parts; ahead, coma and
tail.
üThe head is formed of ice, particle of rocks and gases.
üWhen the comet become close to the Sun and heat up,
then gases released and make cloud around is called coma.
üWhen Comets near the Sun a long tail of gases and dust particles is formed.
Meteors (شہاب ثاقب) are small
solid bodies that enter a planet’s atmosphere it burns due to fraction produced
by its rapid motion.
Meteors entering our atmosphere burn up 50 to 100 km above
the surface of the earth.
Some meteors are very large and sometime strike on the surface of the
earth is called meteorites.
Sputnik is an artificial satellites launched by the Soviet
Union from 1957to 1961. The goals of the
sputnik program included studding the earth upper atmosphere.
Geostationary Satellites are communication
satellites using geostationary orbit.
Pakistan has launched its first geostationary
satellite, pak sat-IR in 2011.
Landsat satellite 1 launched United States
in1972. It’s using for land mapping.
Polar satellite revolves around the earth over the both
north and south poles. They provide weather information and also map
ozone levels.
Global Positioning System (GPS) is a group of 24
satellites that transmit signals to and from all parts of the world.
The system enables a GPS receiving person to determine its location,
speed, direction and time.
Navigational satellites pinpoint the location of
objects on Earth.
Surveillance satellites are used to monitor military
activities.
Yuri Gagarin was first man first
orbits the earth.
Valentine Tereshkova first woman in space.
Neil Armstrong and Edwin Aldrin were the
first Americans to step on the moon in 1969.
Over 300 communication satellites have been launched since
1957.
Pakistan sent the first SatelliteBadr-I
in 1990s.
Meteors entering our atmosphere burn up 50 to 100 km above
the surface of the earth.
Some meteors are very large and sometime strike on the surface of the
earth is called meteorites.
Sputnik is an artificial satellites launched by the Soviet
Union from 1957to 1961. The goals of the
sputnik program included studding the earth upper atmosphere.
Geostationary Satellites are communication
satellites using geostationary orbit.
Pakistan has launched its first geostationary
satellite, pak sat-IR in 2011.
Landsat satellite 1 launched United States
in1972. It’s using for land mapping.
Polar satellite revolves around the earth over the both
north and south poles. They provide weather information and also map
ozone levels.
Global Positioning System (GPS) is a group of 24
satellites that transmit signals to and from all parts of the world.
The system enables a GPS receiving person to determine its location,
speed, direction and time.
Navigational satellites pinpoint the location of
objects on Earth.
Surveillance satellites are used to monitor military
activities.
Yuri Gagarin was first man first
orbits the earth.
Valentine Tereshkova first woman in space.
Neil Armstrong and Edwin Aldrin were the
first Americans to step on the moon in 1969.
Over 300 communication satellites have been launched since
1957.
Pakistan sent the first SatelliteBadr-I
in 1990s.
Over…….. Communication satellites have been launched since 1957. (According to new course)
a) 100
b) 200
c)200
d) 600
