24-25 8th Grade Science 1st Semester, Part 3 Quiz

What is the estimated number of stars in the universe according to astronomers?

• 1 million

• 1 billion

• 1 trillion

• 1 septillion

What elements do stars produce that are essential for life?

• Helium and neon

• Carbon and oxygen

• Gold and silver

• Sodium and chlorine

What is the primary composition of our sun?

• Iron and nickel

• Hydrogen gas

• Carbon dioxide

• Methane

What is a typical star primarily made of?

• Hydrogen and helium

• Oxygen and nitrogen

• Carbon and iron

• Silicon and magnesium

What process do stars use to produce energy?

• Nuclear fusion

• Chemical reaction

• Photosynthesis

• Combustion

Which color stars are the hottest?

• Blue stars

• Red stars

• Yellow stars

• White stars

What is the unit used to describe the distance to stars other than the Sun?

• Light-year

• Light cycles

• Years

• Aldrins

What happens to a sun-like star when it begins to run out of fuel?

• It becomes a red giant

• It becomes a black hole

• It becomes a neutron star

• It becomes a supernova

What does the H-R diagram represent?

• The relationship between a star's mass and its age

• The relationship between a star's temperature and its luminosity

• The relationship between a star's distance and its brightness

• The relationship between a star's size and its color

In the H-R diagram, what does each point plotted represent?

• A different galaxy

• A different planet

• A different star

• A different constellation