Galaxies
show us how the matter in the universe is organized on large scales
. In order to understand the nature and history of the universe, scientists study how the matter is currently organized and how that organization has changed through out cosmic time.
How are galaxies important to our existence group of answer choices?
E) Galaxies
provide the gravity that prevents us from falling off Earth
. Galaxies recycle heavy elements produced in stars into future generations of stars. Earth is made mostly of metals and rocks.
Why is the Milky Way important to humankind?
Importance of the Milky Way. The Milky Way
allows to look in great detail at the workings of a moderate sized spiral galaxy
. It is the foundation for our understanding of what goes on inside galaxies, much as the sun is the foundation of our entire understanding of stars.
What are 3 interesting facts about galaxies?
Fun Facts about Galaxies
The closest galaxy to the Milky Way is Andromeda, which is around 2.6 million light years away from us
. Many galaxies are more than 100,000 light years across in distance. It takes over two hundred million years for the sun to orbit the center of the galaxy. This is called a galactic year.
Why are galaxies important to our existence quizlet?
Without galaxies, the universe could not be expanding. C) Galaxies
prevent planets from leaving their orbits around stars
; e.g., our galaxy prevents Earth from leaving its orbit of the Sun.
What can we learn from studying galaxies?
Through probing the extreme environments of faraway massive galaxies, we can learn
not only about their evolution and the history of the universe, but most importantly about the fundamental processes regulating the formation of stars
.
What best describes the Milky Way galaxy?
The Milky Way is a
large barred spiral galaxy
. All the stars we see in the night sky are in our own Milky Way Galaxy. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area.
In what ways do galaxies differ from one another?
How do galaxies differ? Galaxies differ in
size, shape, and the ages of their stars
.
What makes up most of the mass of the Milky Way galaxy quizlet?
Most of the mass of the Milky Way is
dark matter
because the orbital speeds of stars far from the galactic center are surprisingly high. Spiral arms appear bright because they contain more ___ ___ stars than other parts of the disk.
Why do galaxies rotate?
We know that galaxy rotation is happening
because the Milky Way is a flattened disk
, in the same way that the Solar System is a flattened disk. The centrifugal force from the rotation flattens out the galactic disk. All stars in the galactic disk follow roughly circular orbits around the center of the galaxy.
What happens when galaxies come together?
Merging galaxies can also
trigger the creation of new stars
. Galaxies are also composed of gas and dust. The gravitational pull of both colliding stars can interact with this materials, creating friction and shock waves that can ignite the formation of new stars.
Can Milky Way galaxy be seen from Earth?
The Milky Way is visible from Earth as a hazy band of white light, some 30° wide, arching the night sky
. In night sky observing, although all the individual naked-eye stars in the entire sky are part of the Milky Way Galaxy, the term “Milky Way” is limited to this band of light.
What are 5 interesting facts about galaxies?
- Galaxies can range in size from a dwarf with as few as ten million stars to massive giant galaxies with a hundred trillion stars. …
- There are over 170 billion galaxies in the observable universe yet there is also a “future visibility limit”.
What do scientists believe exists at the center of galaxies?
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.
What are the things in galaxies?
Most of the objects we know of in space are contained within galaxies. They contain
stars, planets, moons, comets, asteroids, nebulae, dust, neutron stars, and black holes
. Many probably even contain large amounts of unseen dark matter.
What do we mean when we say the universe is expanding?
When we say the universe is expanding, it means
the average distances between galaxies are increasing with time
. It's thought that our universe is 14 billion years old; and expansion had to start somewhere, thus creating the idea of the Big Bang.
Can galaxies form without dark matter?
Scientists have detected a handful of other galaxies with potentially little to no dark matter, but none have as convincing data, Mancera Piña says. “I think the results show that
you can have galaxies without dark matter
.”
What does it mean if an experiment is replicable Why is it important that experiments be replicable quizlet?
If an experiment is replicable it means that
anybody can repeat the experiment and get the same results
. It is important that experiments be replicable because if someone else can't repeat what you did, you might have made a mistake.
How do galaxies change over time?
Yet over the past several billion years, many galaxies in clusters have changed
from spiral to a smooth, or “lenticular,” disk shape
. Theory suggests that galaxies can change from spiral to lenticular when two of them collide in slow motion interactions.
Are galaxies still being created?
The galaxy-formation process has not stopped
. Our universe continues to evolve. Small galaxies are frequently gobbled up by larger ones. The Milky Way may contain the remains of several smaller galaxies that it has swallowed during its long lifetime.
How are galaxies affected by dark matter?
Dark matter can also affect the path of light. In a phenomenon known as gravitational lensing, dense objects can cause the light of distant objects to bend around it. This can result in
distorted images and duplicate images of stars and galaxies
.
When did humans learn that the Earth is not the center of the universe?
In
1543
, Polish astronomer Nicolaus Copernicus questioned the idea that the Earth was the center of the universe, but couldn”t provide proof. Galileo did.
How many stars does the galaxy have?
Galaxy observations
Some estimates peg the Milky Way's star mass as having 100 billion “solar masses,” or 100 billion times the mass of the sun. Averaging out the types of stars within our galaxy, this would produce an answer of
about 100 billion
stars in the galaxy.
Which statement best describes the number of galaxies and stars in the universe?
Which statement BEST describes the number of galaxies and stars in the universe?
Millions of galaxies and billions of stars
. The universe contains many galaxies including the Milky Way galaxy. The Milky Way galaxy contains stars, planets, moons, and other objects.
Why do galaxies collide?
Many large galaxies can attract a smaller galaxy.
The gravity of the large galaxy will pull the smaller one towards it, creating a collision
. If one galaxy has enough momentum, the galaxy with enough movement or momentum could keep moving away after the collision.
Can there be life in another galaxy give reasons for your answer?
Yes, there are many possibilities of life in another galaxy
. EXPLANATION: The universe is comprised of about 250 billion galaxies and many researches have done to find the possibilities of living in the nearby galaxies or in other galaxies.
How does gravity affect galaxies?
How does gravity affect galaxies? Every object in space exerts a gravitational pull on every other, and so
gravity influences the paths taken by everything traveling through space
. It is the glue that holds together entire galaxies. It keeps planets in orbit. …
