به انگلیسی

Changing Ideas About Space

Science · Space Exploration · ages 9-11

Name ______________________ Date ____________

Who was the ancient thinker most linked to the geocentric model?
- Copernicus
- Ptolemy
- Galileo
What is the geocentric model of the solar system?
- Earth stays still at the centre, and everything else circles around it
- The Sun stays still at the centre, and everything else circles around it
- Every planet moves around in its own separate space
Who proposed that the Sun sits at the centre of the solar system, not Earth?
- Ptolemy
- Galileo
- Copernicus
True or false: in the heliocentric model, the Sun stays still while Earth moves around it.
Circle one: True False
What did Galileo see through his telescope that supported the heliocentric model?
- Moons circling around Jupiter
- Rings circling around the Moon
- Clouds moving across the Sun
Look at the timeline of ideas. Whose idea came between Ptolemy's and Galileo's telescope proof?
- Newton
- Copernicus
- Aristotle
Why did people believe the geocentric model for so long before Copernicus came along?
- Because it matched what they could see: the Sun and stars seeming to move across the sky above a still Earth
- Because Ptolemy forced everyone to agree with him
- Because nobody had ever looked up at the sky before
Milo tells you Ptolemy proved the Sun sits at the centre of everything. What is wrong with what Milo said?
- Ptolemy lived after telescopes were invented
- Ptolemy never studied the sky at all
- Ptolemy actually believed Earth was at the centre, not the Sun

Answer key

For grown-ups. Fold this page away before handing over the rest.

Ptolemy · Ptolemy wrote down the Earth-centred idea, and people trusted it for well over a thousand years.
Earth stays still at the centre, and everything else circles around it · Geo means Earth. In this old model, Earth does not move, and the Sun, Moon, and stars circle around it.
Copernicus · Copernicus proposed this heliocentric, or Sun-centred, model.
True · That is exactly Copernicus's idea: the Sun stays in the centre while Earth orbits it.
Moons circling around Jupiter · He saw small moons orbiting Jupiter, proving that not everything in the sky circles Earth.
Copernicus · Copernicus proposed the Sun-centred idea after Ptolemy, and later Galileo found proof for it.
Because it matched what they could see: the Sun and stars seeming to move across the sky above a still Earth · Without a telescope, Earth looks and feels still, so a Sun that seems to cross the sky each day was easy to believe.
Ptolemy actually believed Earth was at the centre, not the Sun · Ptolemy supported the geocentric model, with Earth at the centre. Copernicus was the one who proposed a Sun-centred model.