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The moon is a satellite. Greeks in the 3rd century BCE noticed the earth's shadow across the moon during lunar eclipses was round, indicating the earth was spherical in shape.

In the 20th century the first artificial satellite, Sputnik, orbited the earth in about 90 minutes.

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Which satellite proved there was a hole in the ozone layer?

None. The ozone hole was first observed from Earth's surface.


How did Galileo become a satellite?

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Pythagoras 6th Century BCE.


What century BC did Greek philosophers establish the Earth wasd a sphere?

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The concept that the Earth is a sphere dates back to ancient Greece, with philosophers like Pythagoras and Plato suggesting a spherical shape. However, it was Aristotle in the 4th century BCE who provided observational evidence, such as the way ships disappear hull-first over the horizon and the circular shadow of the Earth on the Moon during a lunar eclipse. Later, in the 3rd century BCE, Eratosthenes famously calculated the Earth's circumference using measurements of shadows in different locations.


How did people learn that the earth was a sphere in the late 20th Century?

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Magellan's sailors proved one of Aristotle's theories by circumnavigating the Earth, which demonstrated that the Earth is a sphere. This contradicted the prevailing belief at the time that the Earth was flat.


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