![]() Since 1971, 12 space stations launched into a low orbit around Earth have been occupied for varying lengths of time. They also employ geostationary relay satellites for continuous communication with mission controllers on the ground and satellite-based positioning systems for navigation. Space stations use large panels of solar cells and banks of storage batteries as their source of electrical power. A space station’s operation, therefore, requires a transportation system to ferry crews and hardware and to replenish the propellant, air, water, food, and such other items as are consumed during routine operations. To make the most efficient use of its carrier vehicle’s capacity, a space station is launched vacant, and its crew members-and sometimes additional equipment-follow in separate vehicles. Small space stations are launched fully assembled, but larger stations are sent up in modules and assembled in orbit. These include observations of the Sun and other astronomical objects, study of Earth’s resources and environment, military reconnaissance, and long-term investigations of the behaviour of materials and biological systems-including human physiology and biochemistry-in a state of weightlessness, or microgravity. ![]() ![]() Depending on its configuration, a space station can serve as a base for a variety of activities. Space station, an artificial structure placed in orbit and having the pressurized enclosure, power, supplies, and environmental systems necessary to support human habitation for extended periods. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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