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This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space. This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole.
Hemiacetals form in the reaction between alcohols and aldehydes or ketones. Using an acid catalyst, the reaction proceeds via nucleophilic attack of the carbonyl group by the alcohol. [4] A subsequent nucleophilic attack of the hemiacetal by the alcohol results in an acetal. [2] Solutions of simple aldehydes in alcohols mainly consist of the ...
Space and survival – Idea that spacefaring is necessary for long-term human survival; Space vehicle – Combination of launch vehicle and spacecraft Launch vehicle – Rocket used to carry a spacecraft into space; Spacecraft – Vehicle or machine designed to fly in space; Spaceflight – Flight into or through outer space
Timeline of Solar System exploration; Timeline of the Space Race; List of cumulative spacewalk records; List of spacewalkers; List of spacewalks and moonwalks 1965–1999; List of spacewalks 2000–2014; List of spacewalks since 2015; Timeline of Spirit; List of space stations
The timeline contains all the flights which have either crossed the edge of space, were intended to do so but failed, or are planned in the near future. Notable test flights of spaceflight systems may be listed even if they were not planned to reach space.
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Polyoxymethylene (POM), also known as acetal, [4] polyacetal, and polyformaldehyde, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability. Short-chained POM (chain length between 8 and 100 repeating units) is also better known as paraformaldehyde (PFA).
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