Components of the Universe

Our Sun is one of the many stars that has been classified as average. Its luminosity and its temperature place it in the middle of the which area of the H-R diagram?

• Main sequence

• White dwarf

• Red giant

• 
  Super giant

Tags

112.20.b.8.A

Stars form inside giant clouds of gas and dust. What are these giant clouds of gas and dust called?

• Black hole

• Quasar

• Supernova

• Nebula

Tags

112.20.b.8.A

Which component of the universe contains all of the other components listed below and would have the greatest mass?

• Solar system

• Nebula

• Galaxy

• Planetary system

Tags

112.20.b.8.A

A Hertzsprung-Russell (H-R) diagram is shown.

 

 

A star that has a luminosity of 10^-2 and a temperature of 20,000 K is most likely a —

• Main sequence

• White dwarf

• Blue giant

• Red supergiant

Tags

112.20.b.8.A

The Hertzsprung-Russell diagram shown is divided into four sections.

 

 

Which section of the diagram includes the coolest, brightest stars?

• 1

• 2

• 3

• 4

Tags

112.20.b.8.A

Which statement best describes a galaxy?

• A cloud of gas that is the birthplace of stars

• A system of billions of stars, gas, and dust held together by gravity

• A ball of plasma that experiences nuclear fusion in its core

• A mass of dust and ice that orbits a star in an elliptical pattern

Tags

112.20.b.8.A

Which statement about stars is correct?

• Star formation begins in a nebula.

• White dwarfs become main-sequence stars when they gain mass.

• Supergiants are stars that can absorb black holes.

• Main-sequence stars are formed by comets.

Tags

112.20.b.8.A

Most stars in the universe fit into one of the four areas on this Hertzsprung-Russell diagram.

Which area of the diagram represents the white dwarfs?

• M

• X

• P

• Z

Tags

112.20.b.8.A

Where in the Milky Way is the Earth found?

• In the middle of the galaxy

• About 1 light-year from the middle of the galaxy

• Varies depending on where it is in orbit around the Sun

• In the spiral arm of the galaxy

Tags

112.20.b.8.A

What is the nearest star to planet Earth?

• 
  Moon

• Sun

• Sirius

• Proxima Centauri

Tags

112.20.b.8.B