What Kind Of Object Do We Think Lies At The Center Of The Milky Way Galaxy Quizlet?

The

orbits of stars

in the center of the galaxy indicate that the presence of 3 to 4 million solar mass object in a region no larger than our Solar System. How does the diameter of the disk of Milky Way Galaxy compare to its thickness?

What kind of object do we think lies in the center of the Milky Way galaxy?

The Galactic Center (or Galactic Centre) is the rotational center, the barycenter, of the Milky Way galaxy. Its central massive object is

a supermassive black hole

What do we think resides in the center of our galaxy that is in Sgr A *)?

The supermassive black hole

that lurks at the center of our galaxy, called Sgr A*, has a mass of about 4 million times that of our Sun. A black hole is a place in space where gravity is so strong that neither particles or light can escape from it. Surrounding Sgr A* is a dense cluster of stars.

What is the best evidence for a supermassive black hole in the center of the Milky Way galaxy quizlet?

Terms in this set (26)

Best evidence for an extremely massive black hole in the center of the milky way? The orbits of stars in the center of the galaxy indicate that

the presence of over 3-million-solar-mass object in a region about 3/4 the size of the orbit of mercury.

What is at the center of the Milky Way galaxy quizlet?

The Galactic center appears to have: A stellar density a million times higher than near Earth. Apparently, there is

a supermassive black hole

in the center of our Galaxy. It is called Sagittarius A and has a mass of 4 million solar masses.

What kinds of objects lie in the visible halo of our galaxy?

The Milky Way's stellar halo contains globular clusters,

RR Lyrae stars with low metal content

, and subdwarfs. Stars in our stellar halo tend to be old (most are greater than 12 billion years old) and metal-poor, but there are also halo star clusters with observed metal content similar to disk stars.

Which statement best describes Hubble's law?

Hubble's law, which says simply that

a galaxy's velocity (or as is sometimes plotted, its redshift) is directly proportional to its distance

, also tells us something important about the state of the universe. If the universe is static and unchanging, there should be no correlation between distance and velocity.

How massive is Sagittarius A *?

What do we think resides in the center of our galaxy that is in Sgr A *)? Quizlet?

When did scientists first detect gravitational waves from mergers of compact objects (pairs of neutron stars or black holes)? What do we think resides in the center of our galaxy (that is, in Sgr A*)? … It is

the continuous recycling of gas in the galactic disk between stars and the interstellar medium

.

What evidence do scientists have that lead them to believe there is a black hole at the center of the Milky Way?

Direct evidence for a supermassive black hole –

a plot of the orbital motion of the star S2 around the centre of the Milky Way

. From these observations, astronomers have inferred that a supermassive black hole of about 3 million solar masses lurks at the centre of our galaxy.

Why do astronomers think that most of the mass of the Milky Way is in the form of dark matter?

Why do we believe 90 percent of the mass of the Milky Way is in the form of dark matter?

The orbital speeds of stars far from the galactic center are surprisingly high

, suggesting that these stars are feeling gravitational effects from unseen matter in the halo.

What lies at the center of our galaxy quizlet?

Most of our galaxy is made up of: dark matter. At the center of our galaxy is:

a supermassive black hole

.

What evidence supports the existence of a very massive black hole at the center of our galaxy?

What evidence supports the existence of a black hole at the center of our galaxy?

The motions of the gas and stars at the center indicate that it contains 4 million solar masses within a region only 3 light-years across

. What is the most common form of gas in the interstellar medium? What is a shock wave?

How is gas recycled in our galaxy quizlet?

How is gas recycled in our galaxy?

Stars are born from the gravitational collapse of gas clumps in molecular clouds

. Massive stars explode as supernovae when they die, creating hot bubbles in the interstellar medium that contain the new elements made by these stars.

Where are the globular clusters in the Milky Way?

Globular clusters orbit

in the halo of our galaxy

, centered on the galaxy's center and expanding above and below the galactic disk. Open star clusters tend to orbit within the disk.

What kinds of objects lie in the disk of our galaxy what kinds of objects lie in the disk of our galaxy?

The Galactic Disk contains old and young stars in population one and population two categories. (Population one stars: metal-rich young stars.) (Population two stars: metal-poor old stars.) The Galactic Disk also contains

gas and dust and spiral arms

which is where our galaxy received its categorized name.

What kinds of objects lie in the disk of our galaxy group of answer choices?

Open clusters and young stars

are generally found only in the disk of the galaxy and not in the halo. We can see most of the galaxy with visible light. Observing the galaxy at radio wavelengths allows us to see beyond the dust in the disk of the galaxy that obscures our view.

How does Hubble's Law determine the distance to a galaxy?

By taking the spectrum of a distant object, such as a galaxy,

astronomers can see a shift in the lines of its spectrum and from this shift determine its velocity

. Putting this velocity into the Hubble equation, they determine the distance.

Is the sun in the halo of the Milky Way?

The Sun is one of roughly 200 billion stars in our galaxy. Our galaxy contains a flattened disk, a small central bulge, and

a spherical halo

. The disk contains stars, gas, and dust, and displays spiral arms.

What does Hubble's law tell us about how galaxies are moving?

Hubble's law, also known as the Hubble–Lemaître law, is the observation in

physical cosmology that galaxies are moving away from Earth at speeds proportional to their distance

. In other words, the farther they are the faster they are moving away from Earth.

How does a lenticular galaxy differ from a spiral galaxy?

How does a lenticular galaxy differ from a normal spiral galaxy?

It has no spiral arms

. What is the major difference between an elliptical galaxy and a spiral galaxy? An elliptical galaxy lacks a disk component.

What is inside a black hole?

At the center of a black hole, it is often postulated there is something called

a gravitational singularity

, or singularity. This is where gravity and density are infinite and space-time extends into infinity. Just what the physics is like at this point in the black hole no-one can say for sure.

How big is the biggest black hole?

Ton 618, the largest ultramassive black hole, appears at the very end of the video, which, at

66 billion times the mass of the Sun

, is going to weigh very heavily on how we daydream about the cosmos moving forward.

Do black holes stretch you?

In the most extreme cases, near black holes,

the stretching is so powerful that no object can withstand it

, no matter how strong its components. … If one were to fall into a black hole feet first, the gravity at their feet would be much stronger than at their head, causing the person to be vertically stretched.

How do we know Sagittarius A is a black hole?

Observations of several stars orbiting Sagittarius A*, particularly star S2, have been used to determine the

mass and upper limits

on the radius of the object. Based on mass and increasingly precise radius limits, astronomers have concluded that Sagittarius A* is the Milky Way's central supermassive black hole.

Does every galaxy have a black hole?

Spectacular jets are powered by the gravitational energy of a supermassive black hole in the core of the elliptical galaxy Hercules A. The jets shoot through space for millions of trillions of miles.

Why is it so hard to see the bulge at the middle of the Milky Way galaxy with visible light group of answer choices?

Why is it so hard to see the bulge at the middle of the Milky Way galaxy with visible light?

There is a lot of gas and dust in the way

. … The three types of galaxies are called: Elliptical, Spiral and Irregular.

Can a wormhole exist?

In the early days of research on black holes, before they even had that name, physicists did not yet know if these bizarre objects existed in the real world. The original idea of a wormhole came from physicists Albert Einstein and Nathan Rosen. …

Do black holes really exist?

There is consensus that

supermassive black holes exist in the centers of most galaxies

. The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light.

Where is most of the current star formation found in the Milky Way galaxy quizlet?

Nearly all star formation in our galaxy takes place in

the disk

.

How do we study the region near the center of our own galaxy the Milky Way quizlet?

How do we learn about what is going on in the center of our own galaxy (the Milky Way)? We cannot see the galactic center with visible or ultraviolet light, but

radio, IR and X rays from the center can be detected

. Which of the following does not accurately describe what we observe toward the Galactic center?

Is a black hole a hole?

No,

a black hole is not really a hole at all

. A black hole is an object just like any other, except that it is extremely dense. This gives it such a high gravitational field that nothing, not even light, can escape. … This may be why it is often misconstrued that black holes are ‘holes' in space-time.

Which kind of these objects do you think is most common in our galaxy?

What kind of object is most common in our galaxy:

white dwarf

, neutron stars, or black holes? white dwarfs, because low mass stars are more common than high mass stars.

What is the proof that black holes exist?

The best evidence of stellar-mass black holes comes from

binary star systems

in which (1) one star of the pair is not visible, (2) the flickering X-ray emission is characteristic of an accretion disk around a compact object, and (3) the orbit and characteristics of the visible star indicate that the mass of its …

What appears to be the characteristics of the object at the center of our galaxy?

TestNew stuff! the further a distant galaxy is from the Sun, the faster it appears to be moving away. What appears to be the characteristics of the object at the center of the Galaxy?

Four million solar masses in a volume smaller than that of Jupiter's orbit.

Is Earth in the Milky Way?

A galaxy is a huge bunch of stars clustered together in space. Our solar system—which includes the sun, Earth, and seven other planets—is part of this galaxy, called … you guessed it … the Milky Way. The Milky Way contains hundreds of billions of stars like our sun.

Can I see the Milky Way from Earth?

From Earth, it can be seen as a hazy form of stars in the night sky that the naked eye can barely notice.

You can see the Milky Way all year

, no matter where you are in the world. It's visible just so long as the sky is clear and the light pollution is minimal.

Where is the Milky Way black hole?

Unexpectedly,

at the heart of the little Leo I

sits a black hole that is nearly as large as the one at the heart of the entire Milky Way, a new study found. The discovery defies expectations as astronomers believed giant black holes grow from collisions between galaxies and should correspond with the galaxy's size.

What lies at the galactic center of the Milky Way quizlet?

Apparently, there is a supermassive black hole in the center of our Galaxy. It is called

Sagittarius A

and has a mass of 4 million solar masses.

What does our galaxy look like quizlet?

Terms in this set (15) What does our galaxy look like? Our galaxy

consists of a flat disk with spiral arms surrounding a central bulge, with a roughly spherical halo surrounding everything

. … The entire galaxy is about 100,000 light years in diameter.

What is true of the lobes of a radio galaxy quizlet?

What is true of the lobes of a radio galaxy?

They are perpendicular to the galactic plane

. … The lobes of a radio galaxy can be as much as: millions of light years from the galaxy's nucleus.