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CRCT Question. Copernicus explained that the planets revolved around the sun. the sun and the planets revolve around Earth. the geocentric system is correct. there are only six planets. Science Test Scores . Reteach: Next Monday 4/16 Retest: Next Tuesday 4/17. The history of

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crct question

CRCT Question

Copernicus explained that

the planets revolved around the sun.

the sun and the planets revolve around Earth.

the geocentric system is correct.

there are only six planets.

science test scores
Science Test Scores

Reteach: Next Monday 4/16

Retest: Next Tuesday 4/17

slide3
The history

of

astronomy!

twitter
Twitter

Write down one “tweet”

  • What you already know about astronomy
  • What do you want to learn about astronomy
  • Anything that comes to mind 
slide5
We expand our

knowledge by

adding to what

people before

us discovered.

slide6
In science, we do

not study

Astrology.

Astrology is the belief that the location of the stars and planets on the day you were born determines your personality and your life. Not based on any scientific evidence!

slide7
The ancient Greeks were some of the first people to try to explain why natural events occurred without reference to supernatural causes.

http://www.thalamus-books.com/books_hunt_living_in_ancient_greece.html

slide8
Ptolemy

A.D.140

http://web.hao.ucar.edu/public/education/sp/images/ptolemy.html

Reasoned that the Earth was

the center of the universe.

slide9
People believed his “geocentric”

system for 1500 years.

Why: Because visually, it

appeared to be correct.

Video clip – planets move

slide10
His evidence:

*The moon circled the earth.

*The sun seemed to circle the earth too.

*He concluded that the stars must also.

His problem:

*Planet motions would not fit.

*This idea is called GEOCENTRIC.

slide11
http://www.shef.ac.uk/physics/people/vdhillon/teaching/phy105/phy105_ptolemy.html

Ptolemy’s model

Notice where the sun is!

slide12
Early astronomers looked for patterns and mathematical relationships.

Astronomers wanted to find evidence to support or reject Ptolemy’s ideas.

slide13
Nicholas

Copernicus

Polish

Astronomer

Mathematician

Early 1500’s

http://www.lucidcafe.com/library/96feb/copernicus.html

slide14
Found evidence for the idea of a heliocentric system.
  • Said that the moon revolved around the earth.

3.The earth rotated to cause day and night.

  • Motions of planets could be explained easily with his system.
  • The earth revolved around the sun to cause a year.
slide15
Copernicus waited until just before he died to publish his work!

Why? Because he knew how upset many people would be about what he said.

slide16
Tycho

Brahe

1546-1601

http://fcomby.tripod.com/Astronomia/cop.html

slide17
Tycho Brahe collected quantitative data for many years.

Often he did not see the

relationships among

his data, but kept it anyway.

slide18
1. First to predict that orbits were not circular.
  • Measured length of day to within 1 second.

3. Data later used to prove that the planets orbit the sun.

slide19
JOHANNES

KEPLER

1571 TO

1630

NASA

slide20
Kepler was an assistant to Tycho in the late 1500s.

He took Tycho’s years of observations

and used math to come up with his

laws of planetary motion.

slide21
1. He figured out that planets closer to the sun feel a stronger solar force and therefore have to move faster to overcome the sun’s gravity.
  • He used Tycho’s data to
  • figure out that the planets’ orbits are not round but are ellipses.

Video clip - orbits

slide22
Galileo

Galilei

1564 -

1642

http://www.pbs.org/wgbh/nova/galileo/images/scie_galileo2.jpg

slide23
1. Did not invent the telescope but did improve it.

2. One of the first to turn the scope to the sky to study astronomy.

3. Saw that there were features on the moon. Highlands and maria.

4. Discovered sunspots and that they proved the sun was not perfect and actually turned on its axis.

slide24
Saw 4 moons of Jupiter that looked like a mini solar system.
  • This helped prove that Earth was revolving around the sun.

8. Saw that Venus went through phases like the moon – indicating change in angle like moon phases.

7. Used experiments to prove and disprove ideas.

slide25
View through a

telescope showing

rotating moons

of Jupiter.

NASA

slide26
Picture of Galileo’s original drawings of Saturn and Venus.

sunearth.gsfc.nasa.gov

Photo of Venus going through phases like the moon.

slide27
Galileo's

telescope

Video clip

alpha.montclair.edu

slide28
And then

came -

Sir Isaac

Newton

slide29
He determined that

the balance between

inertia and gravity

keeps planets in orbit.

slide30
Inertia - - - -

The tendency of a moving object to continue in a straight line or a stationary object to remain at rest.

slide31
Gravity - - - -

The force of attraction between objects - the force depends on the mass of the two objects and the distance between them.

slide33
Newton invented

a new telescope

using mirrors.

Newton’s

Telescope

http://physics.bemidjistate.edu/archives/newton-telescope.gif

summary
Summary

“Who’s Who”

Due TOMORROW

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