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The Global Positioning System consists of 24 satellites but only 4 have to be visible for positioning.
satellite navigation, satellite, navigation, GPS, Global Positioning System, positioning, distance measurement, elevation, civil, military, geography
Combining a conventional internal combustion engine propulsion system with an electric propulsion system reduces emission.
The geographic coordinate system enables every location on the Earth to be exactly specified.
The system of circles of latitude and longitude on the globe enable every location on the Earth to be exactly specified.
This animation demonstrates how cell phones work.
The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.
The International Space Station is a habitable satellite built with the cooperation of 16 countries.
Space probes and Mars rovers examine the structure of Mars and possible traces of life.
The first calendars and time-measuring instruments were already used by ancient Eastern civilizations.
Neil Armstrong, one of the crew members of Apollo 11 was the first man to set foot on the Moon.
Several ingenious instruments have been invented over the centuries to help in navigating the seas.
Satellites orbiting the Earth can be used for civilian or military purposes.
The Space Shuttle was a manned, reusable spacecraft operated by NASA.
The Earth is composed of several spherical layers.
The Earth’s magnetic North and South poles are located near the geographic North and South poles.
The range of applications of unmanned aerial vehicles ('drones') keeps growing.
The Voyager space probes were the first man-made objects to leave the Solar System. They gather data about outer space and carry information about humanity.
Yuri Gagarin became the first human in space on April 12, 1961.
The Internet allows us to send data quickly to large distances.
The Soviet-made satellite was the first spacecraft to be launched into outer space (in October 1957).
Lighthouses are used as an aid to navigation in coastal waters.