GCSE Astronomy Topic 8

The (incorrect) model of the solar system with Earth at the centre is called the g________ model.

The model of the Solar system with the Sun at the centre is called the h_________ model

Which astronomer (with a metal nose) made thousands of accurate measurements of the positions of planets which helped establish the heliocentric model

• Tycho Brahe

• Nicolas Copernicus

• Isaac Newton

• Johannes Kepler

Johannes Kepler found that the best shape for a planet's orbit to match observations was the...

• Ellipse

• Circle

• Parabola

• Sphere

Planets orbit the Sun in ellipses due to the force of ______

The point in an elliptical orbit where a planet is closest to the Sun is called the...

• Perihelion

• Perigee

• Apogee

• Aphelion

Who formulated the three laws of planetary motion?

• Isaac Newton

• Galileo Galilei

• Johannes Kepler

• Tycho Brahe

The point in an elliptical orbit where a planet is farthest from the Sun is called the...

• Aphelion

• Perihelion

• Apogee

• Perigee

Kepler's first law of planetary motion states that planets orbit the Sun in ellipses with the Sun at one of the ____ of the ellipse

• foci

• centres

• ends

• lines of symmetry

Kepler's second law of planetary motion states that in an equal time, a planet sweeps out an equal ____