Stars

A big cloud of dust and gas where all

stars begin their life cycle is called a

• solar system

• universe

• galaxy

• nebula

Why do massive stars have shorter

life-spans than average stars?

• They have less steps in their life-cycle

• They have less fuel to burn

• They burn through their fuel faster

• They are cooler

Which is an accurate description of determining a stars life span? 

• the less mass of the star the longer the life span
• stars never die
• all stars shine the same
• stars don't have a life cycle

Characteristics used to classify stars include:

• distance, size, and color.

• size, distance, and brightness.

• color, brightness, and distance.

• size, brightness, and temperature.

A star is born when:

• a nebula expands

• helium and oxygen combine

• nuclear fusion starts

• a protostar begins to cool

What color are the coolest stars?

• blue-white

• yellow

• red

• orange

The absolute brightness of a star depends on its:

• distance and temperature

• size and temperature

• color and temperature

• distance and color

Which stars look the largest and brightest in the night sky?

• The stars that are older than the Sun

• The stars that are larger than Earth

• The stars that are closest to the Earth

• The stars that are the same color as the Sun

What happens to the core in a sun-like star after all the hydrogen is used up?

• the core will start fusing carbon instead

• it will collapse

• the core explodes

• it starts to expand

"Hydrogen-shell burning" refers to core

• imminent collapse causing a supernova explosion.

• expansion in a sun-like star to continue fusing hydrogen.

• contraction in a sun-like star to continue fusing hydrogen.

• hydrostatic equilibrium to cease.