STAR WARS 1

Question 1

Retrograde motion:

Answer 1

Is the apparent backward movement of the planet through the sky. But appears to do so because of the relative position of the planet and Earth and how they are moving around the Sun.

Question 2

Galaxy:

Answer 2

collection of stars, gases, dust held together by the force of gravity

e. g.
- spiral
- elliptical
- irregular

Question 3

Star:

Answer 3

giant ball of hot glowing plasma, which generates energy in core through nuclear reactions

Question 4

Plasma:

Answer 4

state of matter that is formed when electrons are stripped from atoms in a gas due to extremely high temperatures. And is made up of positive ions and free electrons

Question 5

Apparent magnitude:

Answer 5

The measure of how bright a star is on earth.

- Bright stars have a low magnitude. Dim stars have a high magnitude.

Question 6

Absolute magnitude:

Answer 6

The measure of the star’s brightness if the stars were the same distance from the Earth

Question 7

What did ARISTOTLE suggest for the model of the solar system?

Answer 7

Geocentric

- Pictured the universe with Earth at the centre

Question 8

What did PTOLEMY suggest for the model of the solar system?

Answer 8

Geocentric + Epicycles

• Allocated a name to an Earth- centred universe as geocentric
• Described planets moving in epicycles (small circles) as they moved in their major circular orbits

Question 9

What did COPERNICUS suggest for the model of the solar system?

Answer 9

Heliocentric

- Suggested the Sun was the centre of the universe, not the Earth (heliocentric model)

Question 10

What did GALILEO contribute to the model of the solar system?

Answer 10

provided evidence to the heliocentric model through refracting telescope

Question 11

What did KEPLER suggest for the model of the solar system?

Answer 11

Heliocentric + ellipses

• Planets move in elliptical orbits around the sun
• Developed laws such as planets move faster in their orbit the closer they get to the sun, planets take a longer time to orbit the sun the further they are from the sun

Question 12

What did ISSAC NEWTON contribute to the model of the solar system?

Answer 12

Inertia of planets with gravity causes orbital motion

Question 13

What did HUBBLE contribute to the model of the solar system?

Answer 13

Discovered that galaxies of the Universe are moving away from each other, the universe is expanding (which means there must have been a starting point).