Transcript Space exploration

AVIATION HISTORY
Lecture 11 : Space
Exploration
Space exploration is the use of
astronomy and space
technology to explore outer
space
The 11 planets
OBJECTIVES
 By end of this section, students will be able to
explain:
 Commercial Space Flight Potential
 How Space Exploration Help Mankind
 How Rocket Works
 Different between Jet Engine and Rocket Engine
 Different between Missile and Rocket
How can we go to outer space
A space shuttle goes about 17,500 mph to keep
its self flying.
Rocket Engine
 A rocket engine produces thrust by
burning a fuel at high pressure and
exhausting the gas through a nozzle. The
oxygen for combustion is carried with the
propulsion system.
 High temperatures and pressures is built
up, the are used to accelerate the exhaust
gases through a rocket nozzle to produce
thrust.
 The heavier the rocket , the greater thrust
needed to get it off the ground.
 Newton 3rd Law: “To every action there is
an equal and opposite reaction."
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 Soviet cosmonaut Yuri Gagarin
became the first human in space
in 1961.
 On July 20, 1969, Astronaut
Neil Armstrong took “a giant
step for mankind” as he stepped
onto the moon.
Space Exploration
• The exploration of space began , with the
launch of the first artificial satellite,
Sputnik 1, which the Soviets sent into
orbit in 1957.
• Globally, 43 countries now have their own
observing or communication satellites in
Earth orbit.
What is Satellites??
What is satellites
 Satellites are placed in their orbits by rockets
 Satellites have many applications including
communications, weather observations and military
uses.
 All satellites use microwaves for sending information.
 These waves travel at the speed of light and are able to
pass through the Earth’s atmosphere.
 On Earth we can receive satellite data through ground
station
How Space Exploration Help
Mankind
Advantages of Space Exploration
 Satellites Telecommunications
 Earth’s Observation Satellites
 Navigation Satellites
 Meteorological Satellites
How Space Exploration Help
Mankind
Satellites Telecommunications
• TV signals are relayed by satellites in orbit
above the Earth.
 Telephone signals, computer data, and
computer images are also transmitted
around the world via satellite.
How Space Exploration Help
Mankind
Earth’s Observation Satellites
 Satellite can observe changes on Earth to
provide valuable information in such areas
as agriculture, disaster management
(flood, tsunami & etc.)
How Space Exploration Help
Mankind
Navigation Satellites
 GPS-Global Positioning System.
 GPS satellites can navigate us at anytime,
any weather & anywhere on the Earth.
 Used by car, aircraft and personal uses to
know the direction
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How Space Exploration Help
Mankind
Meteorological Satellites
 Weather Forecasting, for example, earlier
weather info could be used to ensure the
safety of flight.
Differences between a jet
engine and rocket engine?
Differences between Jet engine
and Rocket engine
Jet engine is an engine using jet propulsion for forward
thrust
Rocket engine is an engine using jet propulsion for upward
thrust
1.
Jet engines do not have their own source of oxygen.
Outside air is sucked into the engine to act as an
oxidizer
Rockets have their own oxygen source, either a liquid tank,
or mixed in with the solid fuel.
2.
Differences between a
missile and rocket?
Differences between a
missile and rocket?
Rocket vs Missile
 Purpose
 Rocket mission is to send the satellite to
outer space.
 Missile mission is as a weapon to attack
high value target.
 Guidance
 Rocket no guidance system.
 Missile has a guidance system.