How Would You Define an X-ray Source?
A source of X-rays is something that emits X-rays. In space, astronomers search for X-ray sources. Radiation emitted by objects in space can take many different forms....
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What Does NASA Stands For?
NASA is an organization that develops and controls space research in the USA. It is an independent agency of the U.S. federal government responsible for the civilian...
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What Is a Calendar Used For?
Calendar is a system used for calculating time. Calendars usually divide year into months and days. A year is the time it takes for the Earth to orbit the Sun once. A...
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How Will You Define Vacuum?
It is a completely empty space. In a vacuum, pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition...
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How Do Satellites Stay up While Orbiting the Earth?
Satellites are any objects that revolve around (orbit) another object in space. Some satellites are natural, while others are artificial (man-made). The moon is an...
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