Stars and Star Systems

What is plasma?

• A) A type of gas

• B) The fourth state of matter

• C) A kind of star

• D) A chemical reaction

What causes a star to have a spherical shape?

• A) Its light emission

• B) The nuclear fusion process

• C) Its own gravity

• D) The rotation around its axis

What elements are involved in the nuclear fusion process in stars?

• A) Oxygen and carbon

• B) Hydrogen and helium

• C) Nitrogen and sulfur

• D) Iron and silicon

What is a binary star system?

• A) A system with two planets

• B) A system with two galaxies

• C) A system with two black holes

• D) A system with two stars

Which of the following is true about Alpha Centauri A?

• A) It is the smallest and dimmest star in the Alpha Centauri system

• B) It is similar to the Sun and is one of the closest stars to the Sun

• C) It is the farthest star in the Alpha Centauri system

• D) It is a binary star system by itself

How many planets have been discovered in the Alpha Centauri system so far?

• A) 1

• B) 2

• C) 3

• D) 4

What is the only area in a star hot and dense enough for nuclear fusion to occur?

• Convective zone

• Corona

• Core

• Photosphere

What is the area called where energy radiates outward from the core of a star?

• Radiative zone

• Convective zone

• Corona

• Photosphere

What is the visible surface of the star called?

• Corona

• Convective zone

• Core

• Photosphere

What term is used to describe the outermost layer of a star that can be seen during a solar eclipse?

• Photosphere

• Convective zone

• Corona

• Radiative zone