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2. Free-space optical communication - Wikipedia

   en.wikipedia.org/wiki/Free-space_optical...

   Free-space optical communication ( FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. "Free space" means air, outer space, vacuum, or something similar. This contrasts with using solids such as optical fiber cable .

3. Tsiolkovsky rocket equation - Wikipedia

   en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation

   The classical rocket equation, or ideal rocket equation is a mathematical equation that describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself using thrust by expelling part of its mass with high velocity can thereby move due to the conservation of momentum . It is credited to Konstantin Tsiolkovsky, who independently ...

4. Timeline of space exploration - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_space_exploration

   Timeline of space exploration. 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.

5. Spacetime diagram - Wikipedia

   en.wikipedia.org/wiki/Spacetime_diagram

   A spacetime diagram is a graphical illustration of locations in space at various times, especially in the special theory of relativity. Spacetime diagrams can show the geometry underlying phenomena like time dilation and length contraction without mathematical equations. The history of an object's location through time traces out a line or ...

6. The Letter People - Wikipedia

   en.wikipedia.org/wiki/The_Letter_People

   While the hand puppets, certain educational materials, a CD with the songs, and most of the big books of the Letter People (all as part of the DIG Pre-K program) are still available on Frog Street Enterprises' online store, any discontinued material such as worksheets, flashcards, the Huggables and other books of the Letter People are still ...

7. Sentence spacing - Wikipedia

   en.wikipedia.org/wiki/Sentence_spacing

   Sentence spacing concerns how spaces are inserted between sentences in typeset text and is a matter of typographical convention. [1] Since the introduction of movable-type printing in Europe, various sentence spacing conventions have been used in languages with a Latin alphabet. [2] These include a normal word space (as between the words in a ...