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History of AstronomyViews of the Solar System
How did all of SPACE start?No one knows for sure, but it’s
believed that…
Between 10 to 20 billion years ago the entire universe was smashed into a TINY atomic dot. It was so hot that it exploded causing the Big Bang, the birth of the universe.
What did it look like?
At first, the universe was a very hot,fireball of expanding, cooling gas. After about one million years the gas started to condense to form the objects in the sky.
How did different views of solar system and theories about what was going on
in outer space develop and change over the years?
Let’s start with Aristotle…
Aristotle (Air-u-stot-ul)
Aristotle:
The “Grandfather of Science”
Believed in the “Geocentric Model”
Thought the planets and stars moved around Earth in perfect circles
Geocentric Model
“Geo” means Earth
+ “centric” means center
-----------------------------------
= Earth-centered model
Geocentric means everything revolves around EARTH…weird!
What technology did Aristotle use?
• Naked eye
• Observed Earth is a sphere
• No telescopes!
Where was Aristotle from?
When did he make his observations?
Scientist from Greece
350 B.C.
Ptolemy (toll-u-me)
Ptolemy
He believed in the GEOCENTRIC MODEL (Earth-centered)
Predicted the positions the planets are in now
What technology did Ptolemy use?
• Naked eye
• No telescopes!
Where was Ptolemy from?
When did Ptolemy make his observations?
Greek
astronomer
140 A.D.
Geocentric Model
Copernicus (cu-per-ni-cus)
Copernicus• “Founder of Modern Astronomy”
• Believed in Earth’s rotation on its axis once each day
AND
• that Earth revolves around the Sun once a year. This is known as the HELIOCENTRIC MODEL.
Heliocentric Model
• “HELIO” means Sun + “CENTRIC” means center = Sun-centered model
• This was radical, new thinking and not easily accepted by other scientists
What technology did Copernicus use?
Naked eye
Where was Copernicus from?
When did Copernicus make his observations?
From Poland
Lived more than 100 years later, in the 1500s…1543 A.D.
Galileo
Galileo:Discovered Jupiter’s 4 largest moons
Used the telescope to prove Copernicus was correct…the Sun is the center of our Solar System (Heliocentric)
Galileo also…
• Observed that we can see phases like our moon when we look at Venus!
What technology did Galileo use?
TELESCOPE!
Made a telescope that could enlarge objects up to 20 times! WOW…that’s not much… It is less than most binoculars today!
Where was Galileo from?
When did he make his observations?
Scientist from Italy
Lived 100 years after Copernicus – 1610 A.D.
Heliocentric Model
Tycho Brahe (Teek-O)
Tycho Brahe
• Made careful observations
• Recorded positions of the planets
• Believed in Heliocentric Model
What technology did Tycho use?
Naked eye
Tycho’s Observatory
Where was Tycho from?
When did he make his observations?
From Denmark
Late 1500’s
Kepler
Kepler• Used Tycho’s data to find elliptical orbits of
the planets (not perfect circles!)
• Heliocentric Model
What technology did Kepler use?
• Naked eye
• Math calculations
• Telescope
Where was Kepler from?
When did he make his observations?
• From Germany
• Worked in the 1500-1600s