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 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 might you find at the center of the Milky Way?
We live in the Milky Way Galaxy, which is a collection of stars, gas, dust, and
a supermassive black hole
at it's very center. … Dust and gas are necessary to form stars, and most stars are formed within the spiral arms.
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 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.
What evidence do we have that there is a black hole at the center of the Milky Way galaxy?
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.
What appears to be the characteristics of the object at the center of the galaxy?
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.
What's in the middle of a Milky Way bar?
It's a
chocolate malt-based nougat
. It's made with egg whites (like a meringue), sugar, corn syrup, malted milk powder, and chocolate.
Why is the center of the galaxy so bright?
The Galactic centre is bright simply
because the are lots of stars packed in there
. The number density of stars in the bulge is high. I'm afraid our Supermassive Black Hole, Sgr A* is utterly unimportant in terms of brightness.
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 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.
What is the ultimate fate of an isolated pulsar?
What is the ultimate fate of an isolated pulsar?
It will slow down, the magnetic field will weaken, and it will become invisible
.
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.
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. …
Will Sagittarius A destroy Earth?
It won't happen
. It is a small and quiet black hole, compared to the giants in some other galaxies. But none will destroy their galaxy.
What lies in the center of our Galaxy?
At its center, surrounded by 200-400 billion stars and undetectable to the human eye and by direct measurements, lies
a supermassive black hole called Sagittarius A*, or Sgr A* for short
. The Milky Way has the shape of a spiral and rotates around its center, with long curling arms surrounding a slightly bulging disk.
What does a Twix bar have in it?
Twix is a caramel shortbread chocolate bar made by Mars, Inc., consisting of
a biscuit applied with other confectionery toppings and coatings
(most frequently caramel and milk chocolate).
Is there a black hole at the center of every Galaxy?
Astronomers believe that
supermassive black holes lie at the center of virtually all large galaxies
, even our own Milky Way. Astronomers can detect them by watching for their effects on nearby stars and gas. This chart shows the relative masses of super-dense cosmic objects.
What type of object in space gives out light?
Almost all of the light in space comes from
stars
. In our region of space, known as the Solar System, the Sun emits most of the light, but that's because the Sun is a star and that's what stars do – they emit light!
Are M&Ms Mars?
M&M's are the
flagship product of the Mars Wrigley Confectionery division of Mars, Incorporated
. The candy originated in the United States in 1941, and M&M's have been sold in over 100 countries since 2003. They are produced in different colors, some of which have changed over the years.
What is in the center of a 3 Musketeers bar?
The
nougat chocolate center
is made by whipping egg whites until they are light and frothy. Sugar syrup is then added, stabilizing the foam and creating “frappé.” Other flavoring ingredients are then added to the frappé to create specific flavors.
Is a black hole an object?
A black hole is
an astronomical object with a gravitational pull so strong that nothing
, not even light, can escape it. A black hole's “surface,” called its event horizon, defines the boundary where the velocity needed to escape exceeds the speed of light, which is the speed limit of the cosmos.
Why can we see black holes?
Black holes
have gravitational fields so strong that even light cannot escape
, so they are defined by the shell of a black, featureless sphere called an event horizon. But the holes can nevertheless be seen. As they consume matter that strays too close, they squeeze it into a superheated disk of glowing gas.
Does time stop inside a black hole?
Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the
black hole, time stops
. … Inside the black hole, the flow of time itself draws falling objects into the center of the black hole. No force in the universe can stop this fall, any more than we can stop the flow of time.
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.
What causes radio pulses of a pulsar?
What causes the radio pulses of a pulsar?
A black hole near the neutron star absorbs energy and re-emits it as radio waves
. As the neutron star spins, beams of radio radiation sweep through space. If one of the beams crosses the Earth, we observe a pulse.
What do pulsars do?
Pulsars are
rotating neutron stars observed to have pulses of radiation at very regular intervals
that typically range from milliseconds to seconds. Pulsars have very strong magnetic fields which funnel jets of particles out along the two magnetic poles. These accelerated particles produce very powerful beams of light.
What does Einstein's general theory of relativity tell us about two white dwarfs orbiting one another very close together quizlet?
Einstein's general theory of relativity tells us that two white dwarfs orbiting especially close together
should emit gravitational waves
, and these waves carry energy and angular momentum away from the system. The result is that the two white dwarfs gradually spiral inward towards each other.
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 is a standard candle quizlet?
Standard candle:
a light source of a known, standard luminosity
. If we measure the apparent brightness of a Sun-like star, we can assume it has the same luminosity as the Sun and use the inverse square law for light to estimate its distance.
How does a lenticular galaxy differ from a normal spiral galaxy quizlet?
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.
How are spiral and elliptical galaxies different?
Spiral galaxies have a central bulge of stars surrounded by a disk that contains arms, which form a spiral structure. …
Elliptical galaxies don't show any
structure, but have a smooth ellipsoidal shape, appearing as a large spherical or elliptical ball of stars.
What kinds of stars lie in the 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 constellation lies in the direction of the galactic center?
This chart shows the location of the Milky Way central region in the night sky. It lies in the direction of the
constellation of Sagittarius (The Archer)
, and is marked with a red circle in the image.
Which of the following types of galaxies have a disk and spheroidal component but lack spiral arms?
A lenticular galaxy (denoted S0)
is a type of galaxy intermediate between an elliptical (denoted E) and a spiral galaxy in galaxy morphological classification schemes. It contains a large-scale disc but does not have large-scale spiral arms.
What universe do we live in?
Our home galaxy,
the Milky Way
, contains at least 100 billion stars, and the observable universe contains at least 100 billion galaxies. If galaxies were all the same size, that would give us 10 thousand billion billion (or 10 sextillion) stars in the observable universe.
Is our galaxy moving?
The Milky Way itself is moving through the vastness of intergalactic space
. Our galaxy belongs to a cluster of nearby galaxies, the Local Group, and together we are easing toward the center of our cluster at a leisurely 25 miles a second.
Are we at the center of the universe?
The universe,
in fact, has no center
. Ever since the Big Bang 13.7 billion years ago, the universe has been expanding.
