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    Univers   Univers
The Universe today is very different from the Universe of the past and of the future. However, we can discover much about the past and the future from what we can currently observe. The Universe today is filled with structure and behavior that is bot...
 
    The Sun, Center of our Solar System   The Sun, Center of our Solar System
The Sun is the closest star to Earth and is the center of our solar system. A giant, spinning ball of very hot gas, the Sun is fueled by nuclear fusion reactions. The light from the Sun heats our planet and makes life possible. The Sun is also an act...
 
    Venus, 2nd Planet from the Sun   Venus, 2nd Planet from the Sun
Venus is the second planet from the Sun and the sixth largest. On June 8 2004, Venus will pass directly between the Earth and the Sun, appearing as a large black dot travelling across the Sun's disk. This event is known as a "transit of Venus" and i...
 
    The Nine Planets   The Nine Planets
The Nine Planets is an overview of the history, mythology, and current scientific knowledge of each planet and the major moons in our solar system. Each page has my text and NASA's images, some have sounds and movies, most provide references to addit...
 
    Saturn, 6th Planet from the Sun   Saturn, 6th Planet from the Sun
Saturn is the sixth planet from the Sun and the second largest. In Roman mythology, Saturn is the god of agriculture. The associated Greek god, Cronus, was the son of Uranus and Gaia and the father of Zeus (Jupiter). Saturn is the root of the Eng...
 
    Uranus, 7th Planet from the Sun   Uranus, 7th Planet from the Sun
Uranus is the 7th planet from the Sun. It was discovered in 1781 by William Herschel and named for the Greek god personifying heaven. A blue-green gas giant, it has almost 15 times the mass of Earth and over 50 times its volume. It is less dense than...
 
    Neptune, 8th Planet from the Sun   Neptune, 8th Planet from the Sun
Neptune is the eighth planet from the Sun and the fourth largest (by diameter). Neptune is smaller in diameter but larger in mass than Uranus. In Roman mythology Neptune (Greek: Poseidon) was the god of the Sea. After the discovery of Uranus,...
 
    Mars, 4th Planet from the Sun   Mars, 4th Planet from the Sun
Mars is the fourth planet from the Sun and the second smallest planet in the Solar System, after Mercury. Named after the Roman god of war, it is often described as the "Red Planet" because the iron oxide prevalent on its surface gives it a reddish a...
 
    The Julian Calendar   The Julian Calendar
The Julian calendar was introduced by Julius Caesar in 45 BC. It was in common use until the 1500s, when countries started changing to the Gregorian Calendar. However, some countries (for example, Greece and Russia) used it into this century, and the...
 
 
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  Ptolemy, Astronomer / Geographer   Ptolemy, Astronomer / Geographer
Claudius Ptolemy was a Greco-Egyptian writer of Alexandria, known as a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in the city of Alexandria in the Roman province of Egypt, wrote in...
 
    Copernicus, Earth moves around the Sun   Copernicus, Earth moves around the Sun
Nicolaus Copernicus was the first astronomer to formulate a comprehensive heliocentric cosmology, which displaced the Earth from the center of the universe. His epochal book, De revolutionibus orbium coelestium (On the Revolutions of the Celestial Sp...
 
    Tycho Brahe, Danish Astronomer   Tycho Brahe, Danish Astronomer
Tycho Brahe was born in Skane, then in Denmark, now in Sweden. His contributions to astronomy were enormous. He not only designed and built instruments, he also calibrated them and checked their accuracy periodically. He thus revolutionized astronomi...
 
    Galileo Galilei, Father of Modern Science   Galileo Galilei, Father of Modern Science
Galileo Galilei was an Italian physicist, mathematician, astronomer, and philosopher who played a major role in the Scientific Revolution. His achievements include improvements to the telescope and consequent astronomical observations, and support fo...
 
    Johannes Kepler, Laws Planetary Motion   Johannes Kepler, Laws Planetary Motion
Johannes Kepler is now chiefly remembered for discovering the three laws of planetary motion that bear his name published in 1609 and 1619). He also did important work in optics (1604, 1611), discovered two new regular polyhedra (1619), gave the firs...
 
    The Gregorian Calendar   The Gregorian Calendar
The calendar used throughout the world today is the Gregorian calendar. It is sometimes called a "Christian" calendar. The Gregorian calendar is the one commonly used today. It was proposed by Aloysius Lilius, a physician from Naples, and adopted by...
 
       
         



 
 
         
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