Why is it difficult to get a good picture of what our milky way galaxy looks like? We are in the middle of one of it’s arms, so we have no perspective. It is very large and the edges are far away and faint. Dust blocks our view when we look toward the center or in the plane.
How do we get a good picture of what our Milky Way galaxy looks like choose the most correct answer?
We cannot see it from the outside. How do we get a good picture of what our Milky Way galaxy looks like? By using infrared or microwaves to penetrate the dust.
Why do disk stars bob up and down as they orbit the galaxy?
Stars in the disk all orbit in the same direction with a little up-and-down motion. Orbits of stars in the bulge and halo have random orientations. Why do orbits of bulge stars bob up and down? … Gravity of disk stars pulls them toward the disk.
How can astronomers measure the mass that the galaxy contains inside the orbit of the sun?
How can astronomers measure the mass that the galaxy contains inside the orbit of the Sun? … They measure the distance to the center of the Galaxy and the period of the Sun’s orbit and then use a modified version of Kepler’s Third Law.When astronomers calculate the Milky Way's mass using star surveys what do they find?
When astronomers calculate the Milky Way’s mass using star surveys, what do they find? The mass you estimate for all the visible stars is only about 1/10 the mass you get from observing star motions.
Why is the density of the Universe so difficult to determine?
Why is the density of the Universe so difficult to determine? A great deal of the material in the Universe does not give off very much (or any) light.
How did we get the picture of the Milky Way?
There are billions more just like it in the Universe. This picture of the Milky Way was captured by NASA’s COBE satellite. This photograph was taken using the infrared spectrum, which allows astronomers to peer through the gas and dust that normally obscures the center of the Milky Way.
How did astronomers determine that elliptical galaxies are composed mostly of dark matter?
How did astronomers determine that elliptical galaxies are composed mostly of dark matter? They measured X-ray emission from hot gas gravitationally bound to the galaxies. … Dark matter consists of material that emits radiation at wavelengths other than visible light.How do astronomers measure the mass of a galaxy?
The mass of the Galaxy can be determined by measuring the orbital velocities of stars and interstellar matter.
How do astronomers determine the mass of the Milky Way galaxy?The masses of galaxies are found from the orbital motion of their stars. … By measuring the star speeds, you find out how much gravity there is in the galaxy. Since gravity depends on mass and distance, knowing the size of the star orbits enables you to derive the galaxy’s mass.
Article first time published onWhy 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.
How old is our galaxy?
Astronomers believe the Milky Way is about 13.6 billion years old — only 200 million years younger than the universe. The galaxy’s evolution began when clouds of gas and dust started collapsing, pushed together by gravity.
What is found almost exclusively in the disk of the Milky Way?
Schematic diagram of the Milky Way. The O, B, and open cluster stars are population I stars, and are found almost exclusively in the Galactic disk. The Galactic Bulge, Galactic Halo, and globular clusters are dominated by population II stars. A kiloparsec (kpc) is about 3,262 light years.
How do scientist know about the Milky Way?
“In the past 75 years, astronomers have refined this picture, using a variety of techniques of radio, optical, infrared and even x-ray astronomy, to fill in the details: the location of spiral arms, clouds of gas and dust, concentrations of moleculesand so on.
How astronomers observe the Milky Way?
We pass the light our telescope gathers through a spectrometer, an instrument that allows us to study the brightness as a function of wavelength. Then we can infer that there is in fact gas present between us and the quasar and we can quantitatively measure various properties of the gas.
What makes up most of the Milky Way's mass?
“The supermassive black hole at the center of the Milky Way is around 6 million solar masses,” which is really tiny on the scale of the entire mass of the galaxy. … Again: 84 percent of the galaxy is made up of dark matter. Dark matter doesn’t seem to interact with normal matter at all, and it’s invisible.
How do astronomers take pictures of galaxies?
The wide-field camera takes large images of the universe. When solar radiation interferes with ultraviolet light, scientists use the solar blind camera, which captures hot stars and other ultraviolet-emitting bodies. The high-resolution camera could take pictures inside galaxies.
Why is the Milky Way called the Milky Way?
The Milky Way gets its name from a Greek myth about the goddess Hera who sprayed milk across the sky. … This is what the Milky Way might look like from the side. It’s like a giant disk with a bump in the middle! Without a telescope , we can see about 6,000 stars from Earth.
What do we use to study our Milky Way galaxy?
The Spitzer Space Telescope is a space-based telescope that was launched in 2003. It orbits Earth, peering out at the Milky Way and through it to the galaxies beyond. It observes radiation in the infra-red wavelength, enabling us to see the heat emitted by new stars forming.
What determines the density of the universe?
In order to measure the density of the Universe, it is necessary to sample a region that is larger than the scale on which the Universe becomes approximately homogeneous. The volume of this region must then be measured, as well as the mass of the matter it contains. The ratio of mass to volume then gives the density.
What is happening to the density of the universe?
In a Universe full of matter, both its overall geometry and its fate are controlled by the density of the matter within it. If the density of matter in the Universe is high (a closed Universe), self-gravity slows the expansion until it halts, and ultimately re-collapses.
What is density of the universe?
The expansion rate we see today indicates that the critical density of the Universe is about 9×10-27 kg m-3. This density, however, is the total density of both matter and energy. … So, ordinary matter has a density corresponding to about one proton for every four cubic metres of volume.
How big is the Milky Way galaxy answer choices?
The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across.
How much mass is in the Milky Way galaxy inside the sun's orbit?
If you take the semi-major axis of the Sun’s orbit to be 8 kiloparsecs and the orbital period to be 250 million years, you can determine that the Milky Way’s mass interior to the Sun’s orbit is approximately 1011 solar masses, or 100 billion times the mass of the Sun.
How many solar masses is the Milky Way?
In one calculation, the Milky Way has a mass of about 100 billion solar masses, so it is easiest to translate that to 100 billion stars. This accounts for the stars that would be bigger or smaller than our sun, and averages them out.
How does dark matter affect the universe?
The even distribution means that dark energy does not have any local gravitational effects, but rather a global effect on the universe as a whole. This leads to a repulsive force, which tends to accelerate the expansion of the universe.
Why do astronomers believe there must be dark matter that is not in the form of atoms with protons and neutrons?
Why do astronomers believe there must be dark matter that is not in the form of atoms with protons and neutrons? Galaxies could not have formed as early as they did without dark matter gravitationally attracting ordinary matter and inducing galactic formation.
What is the effect that dark energy is having on the galaxies in our universe?
Because this energy is a property of space itself, it would not be diluted as space expands. As more space comes into existence, more of this energy-of-space would appear. As a result, this form of energy would cause the universe to expand faster and faster.
How do we know the shape mass and center of Milky Way if we are in it?
The clues we have to the shape of the Milky Way are: 1) When you look toward the Galactic Center with your eye, you see a long, thin strip. This suggests a disk seen edge-on, rather than a ellipsoid or another shape. We can also detect the bulge at the center.
Why is it so difficult to study the center of our galaxy?
Why is it so difficult to study the center of our galaxy? Interstellar dust blocks almost all light before it reaches Earth. … Most of the light that makes the hazy band of the “milky way” visible in the night sky comes from reflection and emission nebulae.
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.
