P3.2.1-P3.2.2 - Discovering the Universe 1 & 2 Flashcards

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1
Q

What did people in Thailand used to think caused solar eclipses?

A

They thought a god called Rahu swallowed the Sun

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2
Q

What is a Solar eclipse?

A

Where the Moon passes between the Earth and Sun so that you cannot see it.

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3
Q

Thousands of years ago what did Indians think the Earth looked like?

A

A flat Earth supported on pillars

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4
Q

Why do scientists use models?

A

To help them to explain observations

To help them to make predictions.

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5
Q

What is meant by the geocentric model?

A

The idea that every object in space orbits the Earth (the Sun, planets etc.)

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6
Q

Who came up with the Geocentric model?

A

Greek astronmers:

Aristotle

Plato

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7
Q

The planets are held in their orbits by which force?

A

Gravity

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8
Q

Which scientist developed ideas that led to our current understanding of gravity?

A

Isaac Newton

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9
Q

Why did people like the idea of the geocentric model?

A

It explain why the Sun and Moon appeared to move.

It did not involve the Earth moving.

It explained why the stars appeared to move.

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10
Q

What is retrograde motion?

A

When the planets appear to move backwards for a part of their orbit.`

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11
Q

What could the geocentric model not explain very well?

A

Retrograde motion

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12
Q

Which model overtook the geocentric model as the newly accepted model of the solar system?

A

The heliocentric model.

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13
Q

Describe the heliocentric model

A

Where all of the planets in our solar system orbit the Sun

The Sun is in the middle

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14
Q

Who came up with the Heliocentric model of the solar system?

A

Nicolaus Copernicus

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15
Q

What did Galilieo discover that led to the acceptance of the helicentric model?

A

That Jupiter had moons orbiting it.

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16
Q

Describe the two things that led to the rejection of the geocentric model.

A

It could not explain retrograde motion in a simple way.

Jupiter had 4 moons orbiting it so everytihing didn’t orbit the Earth.