All of the following observations are real. Which one does not support the model in which active galactic nuclei are powered by accretion disks around massive black holes?

The most luminous active galactic nuclei have huge redshifts. More test answers on https://studyhippo.com/mastering-astronomy-chapter-21-galaxy-evolution/

(14) Why do sunspots appear dark in pictures of the Sun? A) They are too cold to emit any visible light. B) They actually are fairly bright but appear dark against the even brighter background of the surrounding Sun. C) They are holes in the solar surface through which we can see to deeper, darker layers of the Sun. D) They are tiny black holes, absorbing all light that hits them. E) They emit light in other wavelengths that we can’t see.

B. They actually are fairly bright but appear dark against the even brighter background of the surrounding Sun. More test answers on https://studyhippo.com/astronomy-final-ch-14/

Many nearby galaxies (a) will become black holes; (b) contain quasars; (e) have radio lobes; (d) were more active in the past.

d) were more active in the past More test answers on https://studyhippo.com/chapter-25-33748/

All of the following observations are real. Which one does not support the theory that active galactic nuclei are powered by accretion disks around massive black holes? 1. X-ray emission from active galactic nuclei can vary significantly in times as short as a few days. 2. Spectra of active galactic nuclei show that clouds of gas are orbiting a central object at very high speed. 3. The most luminous active galactic nuclei have huge redshifts. 4. The total luminosity of an active galactic nucleus can be as high as about 10 billion times that of the Sun.

3. The most luminous active galactic nuclei have huge redshifts. More test answers on https://studyhippo.com/astronomy-chapter-21-concept-quiz/

Black holes are formed from the collapse of ____ stars, and _____ be directly viewed through telescopes.

very large, cannot More test answers on https://studyhippo.com/earth-science-test-1/

White dwarfs are so called because ANSWER: they are the opposite of black holes. it amplifies the contrast with red giants. they are both very hot and very small. they are the end-products of small, low-mass stars. they are supported by electron degeneracy pressure.

they are both very hot and very small. More test answers on https://studyhippo.com/assignment-08-chapter-18-the-bizarre-stellar-graveyard-39295/

Black holes, images of x-Rays

The Chandra X-Ray Observatory is used to study _____ _____ and produces More test answers on https://studyhippo.com/science-studying-the-sun/

White dwarfs are so called because A) they are both very hot and very small. B) they are the end-products of small, low-mass stars. C) they are the opposite of black holes. D) it amplifies the contrast with red giants. E) they are supported by electron degeneracy pressure

A) they are both very hot and very small. More test answers on https://studyhippo.com/astr-102-chapter-18-the-bizarre-stellar-graveyard-35656/

Tides are influenced by the gravitational forces of black holes.

F More test answers on https://studyhippo.com/oceanography-chapter-11-efsc/

Home Page Science Physics Black Holes

Black Holes Flashcards, test questions and answers

Discover flashcards, test exam answers, and assignments to help you learn more about Black Holes and other subjects. Don’t miss the chance to use them for more effective college education. Use our database of questions and answers on Black Holes and get quick solutions for your test.

What is Black Holes?

A black hole is a region of spacetime where gravity is so strong that not even light can escape its pull. Black holes are some of the most mysterious and fascinating objects found in outer space. They form when very large stars collapse under their own weight, leaving behind a small, dense core containing an enormous mass.Black holes were first predicted to exist by Albert Einstein’s Theory of General Relativity in 1915, but it wasn’t until 1964 that they were confirmed to exist after astronomers identified a massive object at the center of our Milky Way galaxy – what we now know as Sagittarius A*. The incredible force generated by black holes makes them incredibly interesting for scientists to study. The immense gravitational forces bend light around the edges of these objects, creating distortions in the fabric of space-time which no other phenomenon can match. In addition, any matter caught within this powerful tug disappears forever, because nothing can escape from inside a black hole. This means that they are essentially invisible to us yet still potentially detectable through their effects on nearby stars and gas clouds making them one of the most elusive phenomena in all astronomy. Although we still don’t fully understand how black holes operate or what happens inside them (or if anything escapes), research continues into this area with new theories being developed every day. Given their incredible power and mystery, it’s likely that there will be many more surprises lurking out there waiting for us to discover about these enigmatic cosmic objects.