strategic, operational, and tactical
Procedures, information, degree of control and structure
The servicing mission was first planned on October 14, 2008. However due failure of Science Instrument Command and Data Handling Unit the NASA postponed the Servicing Mission 4(SM4, the last servicing mission), until May 2009
it's better to have a control but no you do not have to have a control in a science fair project
A control group is the unaffected group in a science experiment.
corrosion science and control means the act of scientist prevent corrosion and find the way to control it
no the control does nothing
Control in a science experiment means it stays the same and you don't do anything to it.
There are two primary outcomes from the Apollo 11 mission. The first, and most important, was that man could travel to the moon, land on its surface, get out and walk around on its surface without sinking under the soil (a real concern many held prior to launch), get back into the spacecraft, rendezvous with the orbiting Command Module, and return safely to Earth. That was the primary, and most important goal, of the Apollo 11 mission. Less important, at least for this mission, was the return of samples and pictures and the placement and execution of some small science experiments on the lunar surface. These were all performed, and the science was important, but it was not the primary goal of the mission.
Croatia
Hahah, good question! I have to do this for science tonight. "/
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Command because this serves no real purpose out in life for them