SPACE EXPLORATIONS Why should humans explore the space

� Why should humans explore the space? � Is it possible for humans to

Voyage to Proxima Centauri � Proxima Centauri, the closest star to us aside from

First Step Into Space � Space Voyages are made possible by the combined use

Rockets � Are self-propelled devices that carry their own fuel, as well as the

How Can Rockets Fly? � Rockets are based on Isaac Newtons Third Law of

How Can Rockets Fly? � The fuel container and burning chamber of a rocket

How Can Rockets Fly? � When the fuel burns, the expanding gases exert an

How Can Rockets Fly? � The tube pushes back with a force on all

How Can Rockets Fly? � A thrust force builds up at the end of

How Can Rockets Fly? � Thrust is the force that propels the rocket forward.

How Can rockets Fly? � On Earth’s surface, a large amount of force is

How Can Rockets Fly? � In space, less thrust is needed to move a

The Space Age � Began in 1967 when USSR used a rocket to launch

The Space Age � Signals from two radio transmitters on Sputnik I were heard

The Space Age � Sputnik I was an artificial satellite

What is a Satellite? � It is an object that revolves around a larger

Artificial Satellite � Are used for communications and for monitoring weather.

Echo � The first reflector communications satellite

Echo � On its surface it had a thin aluminum coating that acted like

Echo � Was used to relay telegrams, telephone calls and pictures across continents and

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SPACE EXPLORATIONS

� Why should humans explore the space? � Is it possible for humans to explore places beyond the solar system? � Will we ever reach other stars? � What are the obstacles that we should overcome before we can make explorations to far places like other galaxies?

Voyage to Proxima Centauri � Proxima Centauri, the closest star to us aside from the sun is 4. 2 light years away. � It means that even if you travel at the speed of light, it will still take you approximately 8 years and 5 months to make a round trip journey to this neighboring star

First Step Into Space � Space Voyages are made possible by the combined use of rocket, radios and computers

Rockets � Are self-propelled devices that carry their own fuel, as well as the oxygen, or other chemical agent, needed to burn fuel. � Fire Arrow, rockets by the Chinese were used as weapons as early as 1232. A fast-burning mixture similar to gunpowder was used as fuel.

How Can Rockets Fly? � Rockets are based on Isaac Newtons Third Law of Motion (also called the law of action-reaction) � This law states that “for every action there is always an opposite and equal reaction”

How Can Rockets Fly? � The fuel container and burning chamber of a rocket is a tube that has nozzle at one end.

How Can Rockets Fly? � When the fuel burns, the expanding gases exert an action force on every inner part of the tube.

How Can Rockets Fly? � The tube pushes back with a force on all surfaces except the nozzle where the hot gases escape.

How Can Rockets Fly? � A thrust force builds up at the end of the nozzle.

How Can Rockets Fly? � Thrust is the force that propels the rocket forward.

How Can rockets Fly? � On Earth’s surface, a large amount of force is needed to overcome gravity and friction

How Can Rockets Fly? � In space, less thrust is needed to move a rocket forward.

The Space Age � Began in 1967 when USSR used a rocket to launch Sputnik I into Earth’s orbit

The Space Age � Signals from two radio transmitters on Sputnik I were heard around the world.

The Space Age � Sputnik I was an artificial satellite

What is a Satellite? � It is an object that revolves around a larger body � We have natural satellites such as the moons � We have the artificial satellites like the Sputnik I

Artificial Satellite � Are used for communications and for monitoring weather.

Echo � The first reflector communications satellite

Echo � On its surface it had a thin aluminum coating that acted like a mirror to reflect light and radio waves

Echo � Was used to relay telegrams, telephone calls and pictures across continents and oceans. � Television images were also relayed by this satellite.