Lecture Notes on Quasars, Galaxies, Dark Matter, and the Universe

Flashcards about quasars, galaxies, dark matter, and the evolution of the universe.

Quasars

Objects that look like stars but emit strong radio waves and have large redshifts.

Galaxies

Quasars reside in the centers of these celestial structures.

High luminosity

What must quasars possess to be visible at great distances?

Supermassive black holes with accretion disks

What powers both active galactic nuclei and quasars?

Mark an early stage

What role do quasars play in galaxy formation according to astronomers?

Galaxy collisions

What can re-trigger quasar activity?

Age of its stars

What can the color of a galaxy tell us?

Yellowish red

What are galaxies that contain only old stars typically colored?

Smaller size, irregular shapes, rapid star formation

What characteristics did galaxies in the early universe have?

Galactic cannibalism

What process is described when a small galaxy is swallowed by a much larger one?

Starburst galaxy

What term is used for galaxies undergoing intense star formation due to galaxy collisions?

Cosmological Principle

What principle states that the universe is the same everywhere on a large scale?

Local Group

What is the name of the galaxy group that includes the Milky Way?

Superclusters

What are large-scale structures formed by groups of galaxy clusters called?

Dark matter

What causes stars and galaxies to move faster than expected?

Gravitational lensing and X-ray radiation

What confirms the presence of dark matter in galaxy clusters?

Nearly uniform

What distribution of matter existed in the early universe?

Mergers of smaller structures

How did large galaxies and clusters form?