Galaxies and Extreme Objects flashcards

0/18

18 cards remaining

Take the chapter practice test

All 18 cards in this deckShow

What is meant by “Event horizon” in this lesson?Black Holes and Multimessenger Astronomy: An event horizon bounds a region from which signals cannot escape to distant observers in the relevant model.
What is meant by “Accretion disk” in this lesson?Black Holes and Multimessenger Astronomy: An accretion disk is orbiting material that can heat and emit as it moves inward.
What is meant by “Tidal force” in this lesson?Black Holes and Multimessenger Astronomy: Tidal force reflects differences in gravitational influence across an object.
What is meant by “Black-hole mass” in this lesson?Black Holes and Multimessenger Astronomy: Mass influences a black hole's gravitational effects and horizon scale under a model.
What is meant by “Gravitational wave” in this lesson?Black Holes and Multimessenger Astronomy: A gravitational wave is a propagating disturbance in spacetime produced by suitable accelerating mass systems.
What is meant by “Multi-messenger astronomy” in this lesson?Black Holes and Multimessenger Astronomy: Multi-messenger astronomy combines different signal types to investigate an event.
What is meant by “Milky Way” in this lesson?The Milky Way: The Milky Way is the galaxy containing the Solar System.
What is meant by “Galactic disk” in this lesson?The Milky Way: A disk is a flattened component containing many stars, gas, and dust.
What is meant by “Galactic bulge” in this lesson?The Milky Way: A bulge is a central stellar component distinct from the extended disk.
What is meant by “Galactic halo” in this lesson?The Milky Way: A halo is an extended component including stars and dark matter in relevant models.
What is meant by “Spiral structure” in this lesson?The Milky Way: Spiral structure organizes patterns in disks and does not imply a rigid rotating set of fixed stars.
What is meant by “Solar location” in this lesson?The Milky Way: The Sun lies within the Milky Way's disk rather than at its center.
What is meant by “Spiral galaxy” in this lesson?Galaxy Types and Interactions: A spiral galaxy has disk structure with spiral patterns under the standard classification.
What is meant by “Elliptical galaxy” in this lesson?Galaxy Types and Interactions: An elliptical galaxy has a smooth broadly ellipsoidal stellar appearance under the classification.
What is meant by “Irregular galaxy” in this lesson?Galaxy Types and Interactions: An irregular galaxy lacks a simple regular spiral or elliptical appearance.
What is meant by “Galaxy interaction” in this lesson?Galaxy Types and Interactions: An interaction changes galaxies through gravitational influence.
What is meant by “Galaxy merger” in this lesson?Galaxy Types and Interactions: A merger combines galaxies through dynamical interaction over time.
What is meant by “Active galactic nucleus” in this lesson?Galaxy Types and Interactions: An active nucleus produces intense emission commonly powered by accretion onto a central supermassive black hole.