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322 BCE
Aristotle
384 - 322 BC aristotle was an Greek philosopher and scientist born in Stagira Chalkidiki -
168
Ptolemy
100-168 AD Ptolemy lived in the city of Alexandria in Egypt he wrote in Koine Greek and held Roman citizenship -
1543
copernicus
Copernicus was born on 19 February 1473 in Thorn (now torun)
he made the central theory was that the Earth rotates everyday on a axis and revolves around the sun yearly -
tycho brahe
tycho was known for his accurate and comprehensive astronomical and planetary observations. tychos system correctly saw the Moon as orbiting Earth and the planets orbiting the sun. -
Hans lippershey
Hans Lippershey was known for the earliest patent of a refracting telescope -
johannes kepler
johannes is a vital figure in the 17th century scientific revolution known for his laws of planetary motion -
Galileo
Galileo was called the "father of observational astronomy" Galileo studied velocity and speed also gravity and free fall. -
Giovanni Cassini
Cassini was known for his astronomy and engineering Cassini discovered four satellites of the planet Saturn -
Sir issac newton
issac newton played a vital role in helping to advance the fields of physics astronomy mathematics also natural sciences -
William Herchel
Herchel is the founder of sidereal astronomy for the systematic observation of the heavens. He discovered the planet Uranus, hypothesized that nebulae are composed of stars, and developed a theory of stellar evolution -
Percival lowell
Percival made an elaborate mathematical study of the orbit of Uranus he also organized a systematic search for the planet by the staff of his observatory -
Edwin Hubble
Edwin often called the father of modern cosmology edwin Hubble made seven discoveries that changed how scientists viewed the universe -
albert einstein
albert made the Theory of special relativity, Theory of general relativity, Photoelectric effect, Unified field theory and the Mercury's orbit. -
Ejnar Hertzsprung
Ejnar was a astronomer who classified types of stars by relating their color to their absolute brightness he also made the luminosity scale of Cepheid variable stars a tool for measurement of intergalactic distances -
sputnik
sputnik is a Soviet artificial satellite the first of which launched on October 4, 1957 was the first satellite to be placed in orbit -
yuri gagarin
yuri gagarin was the first man in space his Vostok spacecraft completed one orbit of the Earth on 12 April 1961. -
apollo program
The apollo program was designed to land humans on the Moon and bring them safely back to Earth -
First space shuttle flight
The first launch of the Space Shuttle happened on 12 April 1981 about 20 years after the first manned space flight it had two crew members astronauts John W. Young, commander and Robert L -
mars pathfinder
Mars Pathfinder was launched December 4, 1996 the rover carried instruments for scientific observations and to provide engineering data The pathfinder returned 2.3 billion pieces of information also more than 16,500 images from the lander and 550 images from the rover -
cassini-huygens orbiter
Huygens was a three-axis stabilized spacecraft equipped for 27 diverse science investigations -
neil armstrong
neil was the first man on the moon he also also flew on the Gemini 8 mission in 1966 -
john glenn
john was the first American to orbit the Earth, circling it three times in 1962 -
What time is it on Saturn?
For a long time the length of a day on Saturn has remained an mystery to frustrated astronomers a student named christopher Mankovich used the planet’s rings to determine that a day on Saturn lasts for 10 hours 33 minutes and 38 seconds. -
difference between refracting and reflecting telescopes
The reflector telescope used two mirrors rather two of the lenses Isaac Newton had made this telescope to combat chromatic aberration a rainbow seen throughout some objects viewed with a refractor telescope light from an object goes into the telescope tube and is reflected off a curved mirror at the end of the tube
