Which Discovery of Galileo Is Most Impressive?
Galileo Galilei (1564-1642), was an Italian astronomer, physicist and mathematician, a pioneer of experimental science who made great
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Sun
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 cen
What Is the Depletion of Ozone Hole?
In 1996 studies conducted by US National Aeronautics and Space Administration revealed a big hole greater than the total surface area of North America…
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…
What Is Twilight?
Twilight is the faint light which appears a little before sunrise and again after sunset before it gets really dark. On the Moon there…