Transcript Earth - Greenville Public School District

Where are we going?
New Quarter = New Unit
EARTH AND SPACE
SCIENCE!
What’s at the center?
• Today we’re talking about what is at the
center of the solar system.
• Sometimes, people disagree. Today we’re
talking about when ancient scientists
disagreed – “what’s at the center?” – the
sun or the earth?
Who cares?
• Have you ever watched the stars
on a clear night and seen them as
they seem to move across the
sky? Why do they look like that?
Essential Question
• So what is at the center for our
world?
Question of the Day: What is at the
center of our solar system and what
scientists figured it out?
Geocentric System
• Ancient Greek astronomers (meaning
they looked at the stars) believed in a
(1) geocentric system.
• A geocentric system means that the
(2) Earth is at the center of the solar
system and all the planets (3) revolve
around the Earth.
Geocentric System
• If you watch the stars at night, it
looks like they’re moving across the
sky.
• During the day, the sun appears to
move across the sky.
• The ancient Greeks saw that and
thought that the sun, moon and stars
were moving while (4) the Earth
stayed still.
Geocentric System
Earth at the center
quick check for ROCKSTAR status
• How do Earth and the
other planets move in the
heliocentric system?
Copernicus
• Enter in the BEAUTIFUL Nicolaus (5)
Copernicus who developed a new
model for the motion of the planets
Copernicus
• Copernicus believed we live in a (6)
heliocentric system
• Helios is Greek for sun
quick check for ROCKSTAR
status
•What do you think a
heliocentric system is?
Heliocentric System
• In a heliocentric system,
Earth and the other planets
(7) revolve around the sun.
Heliocentric System
quick check for ROCKSTAR status
• What is the difference
between a heliocentric and
geocentric system?
• People disagreed with Copernicus
because they did not want to think
that the Earth was not at the center
of the universe
In science, we need more
EVIDENCE to convince someone!
• Enter in the BEAUTIFUL Galileo
Galilei who gave us evidence
In science, we need more EVIDENCE to
convince someone!
• (8) Galileo used
the newly
invented (9)
telescope to
make discoveries
that supported
the heliocentric
model.
In science, we need more EVIDENCE to
convince someone!
• Galileo used a telescope to see (10) four
moons revolving around Jupiter.
• This proved that not
everything in the sky
revolves around Earth.
In science, we need more
EVIDENCE to convince someone!
• Galileo also saw that Venus
(11)goes through phases like
Earth’s moon.
• Venus would not have phases if it
circled around Earth.
quick check for ROCKSTAR status
•What is a geocentric
system?
Quick check for ROCKSTAR status
• Which superstar scientist helped
us figure out the RIGHT model
for our solar system??
quick check for ROCKSTAR status
•What is a heliocentric
system?
quick check for ROCKSTAR status
•How did Galileo’s
observations of Jupiter
and Venus support
Copernicus’ model?
Quick check for ROCKSTAR Status
• Sooooo what object is in the
center of our solar system??
quick check for ROCKSTAR status
• People often say that the sun
rises in the east, crosses in the
sky, and sets in the west. Is this
literally true? Explain.
Quick Check for ROCKSTAR Status
• Make a prediction….if the world DID revolve
around the Earth…would the sun and moon
act the same way they do now??