In the context of spaceflight, a satellite is an object that has been intentionally placed into orbit. These objects are called artificial satellites to distinguish them from natural satellites such as Earth’s Moon.
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vacuum tube
invented by John Ambrose Fleming
A vacuum tube, electron tube, valve (British usage), or tube (North America),…
Electron microscope
invented by Ernst Ruska
An electron microscope is a microscope that uses a beam of accelerated…
DVD
invented by Panasonic Philips Sony Toshiba
The DVD (common abbreviation for Digital Video Disc or Digital Versatile Disc)…
Zeppelin
invented by Theodor Kober
A Zeppelin is a type of rigid airship named after the German inventor Count…
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