Stars in elliptical galaxies that appear spherical in shape have velocities that: Active star formation does not occur in elliptical galaxies because they: Spiral structure can be triggered in a disk galaxy by: a close encounter with a passing galaxy, an orbiting dwarf galaxy, an off-center burst of star formation in the disk.
The chemical abundance of a main-sequence star usually reflects how much nuclear burning has gone on inside it. The habitable zone for a 1 M¤ star ranges from 0.9 to 1.4 AU from the star.

Molecular clouds are best observed at __________ wavelengths. [10], Further discoveries by astrophysics teams from both the University of Virginia and the University of Massachusetts Amherst, drawing upon the 2MASS Two-Micron All Sky Infrared Survey data, revealed the entire loop-shaped structure. In 1974, astronomers sent a message toward globular cluster M13. the gravitational tidal force of the Milky Way. The gravitational tidal force of the Milky Way If the sum of the mass and energy density in the universe yields W < 1 then the universe will recollapse in a Big Crunch. Discover the cosmos! By observing the motions of stars near the center of the galaxy What is ripping apart the Sagittarius dwarf spheroidal galaxy? Robert Nemiroff More luminous giant galaxies tend to have __________ supermassive black holes at their centers. A galaxy rotation curve is a plot of the rotation speed as a function of the: What makes up the majority of the mass of an individual spiral galaxy? TRUE OR FALSE: Our galaxy is a typical barred spiral galaxy. What is ripping apart the Sagittarius dwarf spheroidal galaxy?

In its looping, spiraling path, it has passed through the plane of the Milky Way several times in the past. Dark matter consists of material that emits radiation at wavelengths other than visible light. We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it. Seyfert galaxies are unique because they have large lobes of radio emission that extend well beyond the visible part of the galaxy. Recent observations indicate that in it allows us to study neutral hydrogen in the interstellar medium. Explanation: The Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph), also known as the Sagittarius Dwarf Elliptical Galaxy (Sgr dE or Sag DEG), is an elliptical loop-shaped satellite galaxy of the Milky Way. gravitationally during these collisions. Jay Norris. What would you conclude about this galaxy?

Cluster A is 10 times farther away than Cluster B. The disks of spiral galaxies appear blue because: spiral galaxies are still undergoing star formation. Imagine you discovered a barred spiral galaxy that was a "Milky Way twin" because the size of the bulge and disk, the arrangement of spiral arms, and other characteristics were just like those in our galaxy. In 1974, astronomers sent a message toward globular cluster M13. There are many more individual stars residing in the Milky Way stellar halo than inside globular clusters. Where do we think life first formed on the Earth? The Sagittarius Dwarf (Sgr), shown as the extended irregular shape below the Galactic Center, is the closest of 9 known small dwarf spheroidal galaxies that orbit our Galaxy. Its detection is comparatively recent because it is faint, and its proximity means that its constituent stars are spread over a large part of the sky, heavily obscured by the many foreground stars of our own Milky Way . The models of both its orbit and the Milky Way's potential field could be improved by proper motion observations of Sgr dSph's stellar debris. Cosmic rays in our galaxy can produce synchrotron radiation at what wavelengths? We observe molecular hydrogen gas (H2) using 21-cm emission. Today only 30 percent of galaxies contain active galactic nuclei. By observing the motions of stars near the center of the galaxy. At least one merger is under way now. No neutral hydrogen gas related to Sgr dSph has been found. M13 is far enough away that even light takes a very long time to reach it. https://quizlet.com/137487150/astronomy-chap-21-flash-cards Jerry It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology. In the Milky Way's outermost halo, the stars orbit: both in the prograde and retrograde directions. You know that both clusters have approximately the same chemical composition and age, and thus their RR Lyrae stars should have the same luminosities. We have created a browser extension. How have astronomers measured the mass of the black hole at the center of our galaxy? Numerical simulations suggest that stars ripped out from the dwarf would be spread out in a long stellar stream along its path, which were subsequently detected. a faint band of light sprinkled with dark clouds; the Sun lies in the disk. [7] In 2018 the Gaia project of the European Space Agency showed that Sgr dSph had caused perturbations in a set of stars near the Milky Way's core, causing unexpected rippling movements of the stars triggered when it moved past the Milky Way between 300 and 900 million years ago. Long-lasting spiral density waves occur in the disk of a spiral galaxy when: rotates at a speed that is different than the gas in the disk.
Somewhat however, because he could have predicted that the universe was expanding even before Hubble observed it. We know that spiral galaxies contain dark matter because the gas in the disk rotates with a velocity that decreases in a way that is similar to our Solar System.

shape below the Galactic Center, Massachusetts Institute of Technology (MIT) astronomers have detected 18 very metal-poor stars in the Sagittarius dwarf galaxy.

There is a 10^9 M¤ black hole at the center of the Milky Way that is rapidly accreting stars and gas. Open star clusters primarily inhabit which part of spiral galaxies? Globular clusters are found in which stellar subgroups of the galaxy? but no such assurances are issued for the I use WIKI 2 every day and almost forgot how the original Wikipedia looks like. concluded that Sgr dSph has orbited the Milky Way for at least one Gya and that during that time its mass has decreased by a factor of two or three. Scientists have shown that ammonia and methane, mixed together with hydrogen, carbon dioxide, or nitrogen, and exposed to electrical sparks, can produce some of the amino acids essential for life. TRUE OR FALSE: We observe molecular hydrogen gas (H2) using 21-cm emission. Dark energy is a force that continually decreases the expansion rate of the universe. The gravitational tidal force of the Milky Way [12] [7], In 2018, the Gaia project of the European Space Agency, designed primarily to investigate the origin, evolution and structure of the Milky Way, delivered the largest and most precise census of positions, velocities and other stellar properties of more than a billion stars, which showed that Sgr dSph had caused perturbations in a set of stars near the Milky Way's core, causing unexpected rippling movements of the stars triggered when it sailed past the Milky Way between 300 and 900 million years ago. The location and motions of interstellar gas can be strongly affected by what?

Halo stars formed before the Milky Way developed a thin stellar disk. The dust in the interstellar medium comes primarily from stellar winds of main-sequence stars. Is Einstein's "biggest blunder" still considered a mistake? TRUE OR FALSE: Some forms of life on Earth are silicon-based. It also exhibits an age-metallicity relationship, in that its old populations are metal poor ([Fe/H] = −1.6±0.1) while its youngest populations have super-solar abundances. SETI's Allen Telescope Array (image below) is designed to search __________ for signs of intelligent life. our Galaxy several times before, and survived! The galaxy formed by the merger of smaller systems. Some forms of life on Earth are silicon-based. That's it. Halo stars near the Sun are distinguished from disk stars by what characteristics? Sagittarius A*, the radio source located at the center of our galaxy, is believed to be: supermassive black hole What is ripping apart the Sagittarius dwarf spheroidal galaxy? Globular clusters have much higher stellar densities than the local solar neighborhood. The velocity of stars stays somewhat constant at distances beyond the visible edges of galaxies, implying that more matter than what we observe in stars and gas must be there. The image below is of a spiral galaxy. Which of the following are NOT predominantly found in the spiral arms of galaxies? Our galaxy is classified as an Sd galaxy in the Hubble sequence. Sagittarius A*, the radio source located at the center of our galaxy, is believed to be: What is ripping apart the Sagittarius dwarf spheroidal galaxy? The average density of the interstellar medium is many times less dense than the best vacuum on Earth. Our Galaxy is being invaded. There are many more individual stars residing in the Milky Way stellar halo than inside globular clusters. Each day a different image or photograph of our fascinating universe is TRUE OR FALSE: The habitable zone for a 1 M¤ star ranges from 0.9 to 1.4 AU from the star. The four fundamental forces of nature are gravity, electromagnetism, the weak force, and the strong force. TRUE OR FALSE: Stars in the Milky Way that are 12 to 13 billion years old are only found in globular clusters. What is ripping apart the Sagittarius dwarf spheroidal galaxy? TRUE OR FALSE: The concept of inflation helps solve both the problems of the flatness of the universe and smoothness of the cosmic background radiation. In spiral galaxies, the size of the central bulge is correlated with the: Approximately __________ of spiral galaxies are barred. Sgr dSph is roughly 10,000 light-years in diameter, and is currently about 70,000 light-years from Earth, travelling in a polar orbit (an orbit passing over the Milky Way's galactic poles) at a distance of about 50,000 light-years from the core of the Milky Way (about one third of the distance of the Large Magellanic Cloud). Stars in the halo are most easily identified passing by the Sun because of their distinctively redder colors. Most of the mass in our galaxy is in the form of: Which of the following are NOT found in our galaxy's halo? Most of the mass in our galaxy is in the form of: Which of the following are NOT found in our galaxy's halo?

Galaxies that are classified as quasars were much more numerous in the past. Although it is one of the closest companion galaxies to the Milky Way, the main parent cluster is on the opposite side of the galactic core from Earth, and consequently is very faint, although covering a large area of the sky. Any asymmetry in the gravity field of a spiral galaxy can induce spiral structure. The concept of inflation helps solve both the problems of the flatness of the universe and smoothness of the cosmic background radiation.

Sagittarius Dwarf: the intense gravitational

Open clusters are only found in the disk of the Milky Way; globular clusters are only found in the halo of the Milky Way. The chemical composition of a star's atmosphere tells us: the chemical composition of the cloud from which the star formed. by observing the motions of stars near the center of the galaxy. At first, many astronomers thought that Sgr dSph had already reached an advanced state of destruction, so that a large part of its original matter was already mixed with that of the Milky Way.

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