Wednesday, October 29, 2008
Earth's Atmosphere
Earth's atmosphere makes Earth a very unique place in the universe. If there wasn't an atmosphere around Earth there wouldn't be any chance that we would be able to live on this planet. Without the ozone layer of the atmosphere the sun's UV rays wouldn't be blocked, and without the green house effect the temperature would have drastic changes making it unbearable for anything to live. The temperatures could be extremely high and extremely low all in one day without this special element. With an atmosphere, if a meteoroid passes into the atmosphere it would burn out before it even got close to land and so it can't do any harm. Without an atmosphere, like on the moon, the meteoroids would collide with the planet and leave large craters. And they would be left there for billions of years because of static equilibrium. Static equilibrium is when there is no change, this is what the moon is. If you walk on the surface of the moon then your foot prints will be there for billions of years after. Earth on the other hand is dynamic equilibrium , meaning that there is change. If you step in a pile of wet mud your foot prints with wash away because of the change in the whether. Earth is very unique because of its atmosphere, without it there would be no way that anything could live on Earth.
Wednesday, October 8, 2008
The Science of Rockets
- Rocket:expels gas one direction -move opposite direction.
originated - China - 1100's - military use and fireworks
- Hot gasses pushed out, gasses push up
Thrust: reaction
force that propels
rocket forward
PROCESS
rocket forward
PROCESS
- 1- rocket launched
- 2- 1st stage falls to Earth
- 3- 2nd stage ignites
- 4 -2nd stage falls to Earth
- 5 - 3rd stage ignites
- 6 - 3rd stage
discarded
- 7 - proceeds into space
- Multistage rockets advantage -weight greatly reduced as rise
- 3rd faster than 1st (stage) = highest velocity
http://z.about.com/d/space/1/0/V/0/1/fire_arrow.gif (the 4 rocket pictures)http://eobglossary.gsfc.nasa.gov/Library/Giants/vonBraun/Images/rocket_firsts.jpg (chinese rocket)http://www.aero.org/publications/crosslink/winter2004/images/03_02.gif (action, reaction) http://www.suntrek.org/images/multi-stage-rockets.jpg (multistage rocket - fuel picture)
Wednesday, October 1, 2008
Space Exploration
The Science of Rockets
NASA used Atlas to launch probes into space and they where made of three major stages: Atlas use fuel boosters and liquid fuel engines to launch the pay load into space, Centaur liquid fuel engines to maneuver into the proper orbit, and Payload the satellite or space craft carried by the rocket and is released from the centaur. There are many additional steps to launching the probes but these are the stages in which they are sent into orbit. There are also other ways of sending the probes into orbit from over the years but this is the latest and most used way of getting the probe into space.
The Space Program
NASA began in 1958 when soon after they began their multiple projects such as: Project Mercury where one person was sent into space and successfully come back, then there was Project Gemini where two people where sent into space and came back successfully. Then a disastrous project was Project Apollo where there multiple astronauts where near the moon when they lost oxygen and the captain was sick so the crew had to fly back to Earth, and they where really dehydrated but they landed back on Earth without any other problems. Then the Galileo was sent into space where it photographed the lunar north and following the Clementine probe was sent to map the lunar surface.
Exploring Space Today
Floating robots are very advanced technology in the world today. Tn the space station the ISS (International Space Station) floats around peoples heads and can control temperature, pressure and the air quality of humans. It has a "videophone" which allows people to communicate throughout the station without holding a phone. The world has made many other advanced objects throughout the years of science.
Using Space Science on Earth
NASA works to discover what we don't know about the space around us, and they help a lot eventhough some people believe that the program is not as important as other things such as education and similiar things. NASA has helped the economy with suppling jobs, producing many sateliite communications, and gained knowledge about what we do not know right now.
NASA used Atlas to launch probes into space and they where made of three major stages: Atlas use fuel boosters and liquid fuel engines to launch the pay load into space, Centaur liquid fuel engines to maneuver into the proper orbit, and Payload the satellite or space craft carried by the rocket and is released from the centaur. There are many additional steps to launching the probes but these are the stages in which they are sent into orbit. There are also other ways of sending the probes into orbit from over the years but this is the latest and most used way of getting the probe into space.
The Space Program
NASA began in 1958 when soon after they began their multiple projects such as: Project Mercury where one person was sent into space and successfully come back, then there was Project Gemini where two people where sent into space and came back successfully. Then a disastrous project was Project Apollo where there multiple astronauts where near the moon when they lost oxygen and the captain was sick so the crew had to fly back to Earth, and they where really dehydrated but they landed back on Earth without any other problems. Then the Galileo was sent into space where it photographed the lunar north and following the Clementine probe was sent to map the lunar surface.
Exploring Space Today
Floating robots are very advanced technology in the world today. Tn the space station the ISS (International Space Station) floats around peoples heads and can control temperature, pressure and the air quality of humans. It has a "videophone" which allows people to communicate throughout the station without holding a phone. The world has made many other advanced objects throughout the years of science.
Using Space Science on Earth
NASA works to discover what we don't know about the space around us, and they help a lot eventhough some people believe that the program is not as important as other things such as education and similiar things. NASA has helped the economy with suppling jobs, producing many sateliite communications, and gained knowledge about what we do not know right now.
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