Are People Living on Mars?
Percival Lowell, an American astronomer, thought he saw canals criss-crossing the deserts of Mars, when he observed the planet though his telescope early this century....
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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 contributions to the fields of...
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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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When Was the First Interstellar Radio Message Sent?
When Was the First Interstellar Radio Message Sent? The Arecibo Message, humankind’s first interstellar radio message, sent from the Arecibo Observatory in Puerto Rico...
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Who Was Galileo Galilei?
Who Was Galileo Galilei? Galileo Galilei (1564-1642), the great Italian scientist and mathematician, was the first astronomer to use a telescope, the discoverer of the...
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