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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Where Did the Water on Earth Come From?
Does Earth have more water than any other planet? We must consider the components of water in order to determine its origin. You may already be aware that small...
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Why Does It Rain Diamonds on Neptune?
It is the only planet in our solar system that can’t be seen with the naked eye. Neptune was also the only planet predicted to exist by mathematicians before it was...
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Why Is Our Galaxy Shaped like a Spiral?
A galaxy is a huge number of stars grouped together. Our galaxy contains about 1,00,000 million stars. It looks like a disc with a flat center and spiral arms. From the...
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When Was the Sextant Invented?
The principle of the instrument was first implemented around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but it was also found later in the...
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