Galaxy Structure and Composition

The video tutorial explores the structure of the galaxy web, focusing on voids, filaments, and nodes. It delves into superclusters, which are large formations made up of smaller clusters and groups of galaxies. The tutorial discusses the size of superclusters, highlighting the ambiguity in measuring them due to the Hubble constant. It also covers the composition of clusters and galaxy groups, emphasizing the presence of elliptical galaxies. The video concludes with a discussion on field galaxies and the significant role of dark matter in shaping the universe.

What are the main structural elements of the galaxy web?

• Clusters and superclusters

• Filaments and voids

• Nodes and filaments

• Voids and nodes

What is a supercluster primarily composed of?

• Dark matter

• Clusters of smaller clusters

• Gas and plasma

• Individual galaxies

How does the size of our local supercluster, Laniakea, compare to the typical size range of superclusters?

• Laniakea is larger than most superclusters

• Laniakea is smaller than most superclusters

• Laniakea is not a supercluster

• Laniakea is about the same size as most superclusters

What is the typical size range of a galaxy cluster?

• Exactly 153 megaparsecs

• Less than 153 megaparsecs

• Between 166.6 and 250 megaparsecs

• More than 250 megaparsecs

What type of galaxy is typically found at the center of a galaxy cluster?

• Dwarf galaxy

• Spiral galaxy

• Elliptical galaxy

• Irregular galaxy

How many galaxies are typically found in a galaxy group?

• Between 2 and 50

• Between 100 and 1000

• More than 1000

• Less than 2

What are field galaxies?

• Galaxies found in clusters

• Galaxies found in superclusters

• Galaxies made entirely of dark matter

• Individual galaxies not associated with any group or cluster

What is the primary component of the galaxy web that shapes filaments and voids?

• Regular matter

• Stars

• Gas and plasma

• Dark matter

What do cosmologists mean when they say galaxies are nested in a halo?

• Galaxies are surrounded by plasma

• Galaxies are surrounded by gas

• Galaxies are surrounded by dark matter

• Galaxies are surrounded by stars

What is significantly less than the matter seen in the galaxy at large?

• Dark matter

• Gas and plasma

• Stars

• Regular matter