Stars and Galaxies Review

The HR Diagram shows a relationship of a star's surface temperature and its

• color

• size

• apparent magnitude

• absolute magnitude

Answer explanation

The HR Diagram plots a star's surface temperature against its absolute magnitude, illustrating how temperature influences a star's intrinsic brightness. Thus, the correct answer is absolute magnitude.

Tells us how bright an object APPEARS from EARTH

• Absolute Magnitude

• Apparent Magnitude

Answer explanation

The term 'Apparent Magnitude' refers to how bright an object appears from Earth, taking into account distance and other factors. In contrast, 'Absolute Magnitude' measures intrinsic brightness at a standard distance.

The HR Diagram illustrates the relationship between a star's luminosity and its

• temperature

• mass

• distance

• age

Answer explanation

The HR Diagram shows the relationship between a star's luminosity and its temperature. As temperature increases, luminosity also tends to increase, making temperature the correct choice.

A galaxy is a large collection of stars, gas and dust. What is responsible for holding the stars, gas, and dust together in a galaxy?

• heat

• light

• gravity

• friction

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

A Hertzsprung-Russell diagram (H-R diagram) is used to…

• classify stars by temperature and brightness

• illustrate various wavelengths of light

• show the distances between stars

• differentiate between stars and planets

Sirius is a star about 8.6 light years away from Earth. Which of these statements is correct based on this information?

• It would take about 8.6 years for astronauts to travel to Sirius.

• Light from Sirius takes about 8.6 years to reach Earth.

• Light from Sirius takes about 8.6 light years to reach Earth.

• Light from Sirius takes about 8.6 billion years to reach Earth.

What are the the 3 types of galaxies?

• Spiral Galaxies, Regular Galaxies, and Lliptical Galaxies

• Spiral Galaxies, Irregular Galaxies, and Elliptical Galaxies

• Milky Way, Elliptical Galaxies, and Spiral Galaxies

• Milky Way, Elliptical Galaxies, and Irregular Galaxies

Distance measurement used by astronomers for distant objects.

• Kilometers

• Light Years

• Miles

• Light Seconds

What is the name of our galaxy?

• Our galaxy is called the Milky Way galaxy

• Our galaxy is called the Andromeda galaxy

• Our galaxy is called the Grand spiral galaxy.

• Our galaxy is called the Whirlpool galaxy.

How many stars are in a galaxy.

• millions or billions

• thousands

• hundreds

• Ten