| Autor: |
Sipiera, Paul P., Kähler, Karen N. |
| Předmět: |
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| Zdroj: |
Salem Press Encyclopedia, 2023. 3p. |
| Abstrakt: |
Since 1957 human beings have launched thousands of satellites and other spacecraft. Most of the spacecraft launched successfully achieve orbit. Those that explode after attaining orbit altitude and those that fail after achieving orbit become space debris (also known as orbital debris or space junk). Anything that reaches orbit altitude—about 300 kilometers (186 miles) above Earth’s surface—becomes a satellite. Once in orbit, objects are constantly under the pull of Earth’s gravity, and, in time, they slowly fall from orbit. The greater the distance from Earth, the longer an object will remain in orbit. Above 1,000 kilometers (621 miles), objects can remain in orbit for at least a century. Objects orbiting at an altitude of 800 kilometers (497 miles) are likely to fall to Earth within decades, and those at altitudes between 200 and 600 kilometers (124 and 373 miles) tend to remain in orbit for several years at best. |
| Databáze: |
Research Starters |
| Externí odkaz: |
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