Final exam Astro 105

Ace your homework & exams now with Quizwiz!

What are galactic collisions

Interacting galaxies are galaxies whose gravitational fields result in a disturbance of one another.

How old is the galaxy?

10-13.6 billion years old

What is a blazar?

A blazar is an active galactic nucleus with a relativistic jet directed very nearly towards an observer.

What is cosmology?

A branch of physics and metaphysics dealing with the nature of the universe, the cosmos.

What is the Brane theory?

A cosmology theory that suggests that our universe is part of a complex, multi-dimensional world.

Who is Edwin Hubble?

A famous astronomer that took the information he gather about redshifts and blue shifts and used this to determine that the larger the shift in the wavelength, or the further the line moves, the faster the star of object is moving away from you.

What is strong force?

A fundamental interaction of nature that acts between subatomic particles of matter and bonds them.

What is Quintessence?

A hypothetical form of dark energy, more precisely a scalar field, postulated as an explanation of the observation of an accelerating rate of expansion of the universe.

What is dark matter?

A hypothetical form of matter that appears not to interact with light or the electromagnetic field.

What is the big crunch?

A hypothetical scenario for the ultimate fate of the universe, in which the expansion of the universe eventually reverses and the universe recollapses.

Who and what are/is Richard Feynman, Feynman Diagrams?

A pictorial representation of the mathematical expressions describing the behavior and interaction of subatomic particles.

What is dark energy?

A theoretical repulsive force that counteracts gravity and causes the universe to expand at an accelerating rate.

What is inflation?

A theory in astronomy that the universe expanded exponentially during its first few moments, after the Big Bang, and has been expanding ever since.

What is general relativity?

Albert Einstein's understanding of how gravity affects the fabric of space-time. G = − 8 π G c 4 T

What are Superstrings?

An attempt to explain all of the particles and fundamental forces of nature in one theory by modeling them as vibrations of tiny supersymmetric strings.

Explain Special Relativity's Constraint on Fluctuating Objects

An explanation of how speed affects mass, time and space. The theory includes a way for the speed of light to define the relationship between energy and matter — small amounts of mass (m) can be interchangeable with enormous amounts of energy

What is vacuum energy?

An underlying background energy that exists in space throughout the entire Universe.

What is a cluster/space cluster?

Collections of galaxies bound together by gravity. They are building blocks for the larger-scale structures of the universe.

Who is Lawrence Krauss?

He founded ASU's Origins Project in 2008 to investigate fundamental questions about the universe and served as the project's director.

Who was Alan Guth?

He was best known for proposing the theory of an inflationary universe, a variation of the big-bang model that was highly influential in guiding modern cosmological thought.

What is electromagnetic force?

One of the four fundamental forces of nature. It is the dominant force in the interactions of atoms and molecules.

What is the Big Bang Theory?

The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature.

What is a Quasars'?

The blazing centers of active galaxies and are powered by a supermassive black hole feeding on humungous quantities of gas.

What is doppler redshift?

The change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave.

What is the Cosmological Constant

The constant coefficient of a term that Albert Einstein temporarily added to his field equations of general relativity.

What is Cosmic Microwave Background Radiation (CMBR)?

The cooled remnant of the first light that could ever travel freely throughout the Universe.

What is weak force?

The force that allows protons to turn into neutrons and vice versa through beta decay.

what is hubble flow?

The general outward motion of galaxies resulting from the uniform expansion of the Universe.

Matter-dominated and Radiation-dominated universe

The radiation-dominated form characterizes our early universe, and the matter-dominated form characterizes our universe today - or so cosmologists believed until observations led to theories of dark energy in the 1990s

What is Recessional velocity?

The rate at which an extragalactic astronomical object recedes from an observer as a result of the expansion of the universe. It can be measured by observing the wavelength shifts of spectral lines emitted by the object, known as the object's cosmological redshift.

What is Hubble's Constant and Law?

The relative rate of expansion.

What is Tully & Fisher's relation and law

The tight correlation of the circular velocity of galaxies with their total baryonic mass

What are Gamma-Ray Bursts?

They are the most energetic and luminous electromagnetic events since the Big Bang.

Four fundamental forces

gravity, electromagnetism, weak nuclear force, and strong nuclear force.

what is High Energy Physics?

the study of fundamental particles and forces that constitute matter and radiation.

Electroweak Theory, Steven Weinberg

the unified description of two of the four known fundamental interactions of nature: electromagnetism and weak interaction.


Related study sets

Energy Flow in Ecosystems Chapter Test Review

View Set

Strategic Management-Chapter 2 (CAP)

View Set

NU141- Chapter 18 Vaccines and Sera

View Set

Chapter 9- Organizational Structure

View Set

Chapter 1: Managerial Accounting and Cost Concepts

View Set

Module 23: Technology & Strategies

View Set