Worksheet: The Structure of the Universe

In this worksheet, we will practice identifying and describing large-scale structures within the universe, such as galaxies, galaxy clusters, and voids.

Q1:

Which of the following statements correctly describes what is meant by the term “globular cluster”?

  • AA globular cluster is a collection of galaxies.
  • BA globular cluster is the matter that is ejected from a star during a supernova.
  • CA globular cluster is a cloud of gas and dust within a galaxy that may eventually collapse to form stars.
  • DA globular cluster is a spherical collection of stars that orbit a galactic core as a satellite.
  • EA globular cluster is the collection of stars at the center of a galaxy.

Q2:

List the following according to size from smallest to largest.

  1. Galaxy cluster
  2. Galaxy supercluster
  3. Planetary system
  4. Galaxy
  5. Globular cluster
  • APlanetary system, galaxy, galaxy cluster, globular cluster, galaxy supercluster
  • BPlanetary system, galaxy, galaxy cluster, galaxy supercluster, globular cluster
  • CPlanetary system, globular cluster, galaxy, galaxy cluster, galaxy supercluster
  • DPlanetary system, globular cluster, galaxy cluster, galaxy supercluster, galaxy
  • EPlanetary system, galaxy, globular cluster, galaxy cluster, galaxy supercluster

Q3:

Which of the following statements correctly describes what is meant by the term “void”?

  • AA void is a cloud of antimatter.
  • BA void is a cloud of gas and dust that absorbs almost all of the light coming through it, which creates a dark region on the night’s sky.
  • CA void is a large region of space in which there are relatively few galaxies.
  • DA void is a point of infinite density that is created when the core of a massive star collapses.

Q4:

What is the name of the galaxy cluster that the Milky Way is part of?

  • AThe Local Group
  • BThe Sculptor Group
  • CThe Draco Group
  • DThe Leo Group
  • EThe Virgo cluster

Q5:

The figure shows the distribution of galaxies in a direction radially away from Earth.

What term is given to features such as those marked by the ellipses in the figure?

  • ADark energy
  • BBlack holes
  • CVoids
  • DDark matter
  • EDark nebulae

Q6:

The figure shows the distribution of galaxies in a direction radially away from Earth.

What term is given to features such as those marked by the ellipses in the figure?

  • AGalaxy clusters
  • BGalaxy superclusters
  • CGlobular clusters
  • DCosmic strings
  • EVoids

Q7:

The figure shows a side-on view of the Milky Way. What are the features marked A?

  • AWhite dwarf stars
  • BGlobular clusters
  • CBlack holes
  • DDust clouds
  • ENebulae

Q8:

The figure shows a side-on view of the Milky Way.

What is the feature marked A?

  • AA globular cluster
  • BThe galactic halo
  • CThe galactic nucleus
  • DThe disk
  • EA satellite galaxy

Q9:

The figure shows a side-on view of the Milky Way.

What is the feature marked A?

  • AThe galactic nucleus
  • BThe galactic halo
  • CA satellite galaxy
  • DA globular cluster

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