In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as Earth's Moon. In 1957 the Soviet Union launched the world's first artificial satellite, Sputnik 1. Since then, about 6,600 satellites from more than 40 countries have been launched. According to a 2013 estimate, 3,600 remained in orbit. Of those, about 1,000 were operational; while the rest have lived out their useful lives and become space debris. Approximately 500 operational satellites are in low-Earth orbit, 50 are in medium-Earth orbit (at 20,000 km), and the rest are in geostationary orbit (at 36,000 km). A few large satellites have been launched in parts and assembled in orbit. Over a dozen space probes have been placed into orbit around other bodies and become artificial satellites to the Moon, Mercury, Venus, Mars, Jupiter, Saturn, a few asteroids, a comet and the Sun. Satellites are used for many purposes.
pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba


A bit of space - puzzle with a cosmic painting
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A bit of space

Added year ago by andi


Jigsaw puzzle - complicated puzzle
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Jigsaw puzzle

Added year ago by andi


Kosmos dla wymagających - Opis galaktyki - kosmos jest wielki
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Kosmos dla wymagających

Added over a year ago by Robert


ewelina d - rakieta startująca w kosmos
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ewelina d

Added over a year ago by ewelina d


The East Coast of the USA - The East Coast of the United States as seen from the International Space Station
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The East Coast of the USA

Added over a year ago by Baldiun


StarTram - StarTram 1960 Magnetantrieb Raumschiff in 1500 KM Startrampe
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Added over a year ago by Balduin


Sonda Cassini - Sonda Cassini przelatuje koło Saturna
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Sonda Cassini

Added over a year ago by 1Maryla