Astronomy

Question 1

What is a comet?

Answer 1

• Lumps of ice and dust that orbit the sun
• Usually highly elliptical orbits

Question 2

What is a geocentric model?

Answer 2

• The theory that suggested the Sun, moon, planets and stars all orbited the Earth in perfect circles

Question 3

What is the heliocentric model?

Answer 3

• Said the Sun was the centre of the solar system
• Evidence was found when Galileo found that the moons of Jupiter did not orbit the Earth, showing that there were things that did not orbit earth, disproving the geocentric model