The Galactic halo contains as much gas and dust as the disk. (T/F)
Q: If a quasar is 1,240 times more luminous than an entire galaxy, what is the absolute magnitude of…
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Q: What would most bright nebulae look like if there were no interstellar dust?
A: A nebula is defined as a large region of interstellar clouds made of dust, hydrogen, helium, and…
Q: If you assume that a globular cluster 2 arc minutes in diameter is actually 27 pc in diameter, how…
A: The expression for the distance from small angle formula, Angular diameter206265=linear…
Q: The Hydra super cluster is at a distance of about 800 MParsec. What is the recessional velocity?
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Q: All of the single red-dwarf stars that ever formed are still on the main sequence today. (T/F)
A: Main sequence stars are those which are fusing hydrogen to helium in their cores. Almost 90% of the…
Q: How does a contracting protostar convert gravitational energy into thermal energy?
A: Stars are formed from clouds of gas present in the interstellar medium. Since the temperature is low…
Q: If a standard passenger aircraft can fly at 0.37 km/s (828 mph), how long (in yr) would it take to…
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Q: If a giant molecular cloud is 73 pc in diameter and a shock wave can sweep through it at 9 million…
A: Given: The diameter of the giant cloud is d = 73 Pc. The time taken by the shock wave to pass…
Q: If a giant molecular floyd is 73 pc in diameter and a shock wave can sweep through it in 9 million…
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Q: The formation of the first high-mass stars in a collapsing cloud tends to inhibit further star…
A: Stars are formed from the interstellar medium. The interstellar medium is made of clouds of gas and…
Q: If a giant molecular cloud is 60 pc in diameter and a shock wave can sweep through it in 3 million…
A: Given the diameter of a giant molecular cloud is d = 60 pc (Parsec) time taken to sweep the cloud is…
Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +15, how far…
A: Given The apparent magnitude of the supernova, mv =+15The absolute magnitude of the supernova, Mv…
Q: Three identical spheres are thrown from the same height above the ground Sphere X is thrown…
A: The initial vertical velocities of ball X and Z are same before collision before collision v' = v+…
Q: If a typical halo star has an orbital velocity of 250 km/s, how long does it take to pass through…
A: A stellar halo is a spherical population of stars and globular cluster that surrounds most disk…
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A: To calculate the distance of the distant galaxies in megaparsecs (Mpc) Hubble’s law is used. If the…
Q: If you assume that a globular cluster 6 arc minutes in diameter is actually 18 pc In diameter, how…
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Q: The Virgo galaxy Cluster Much smaller than the Local Group. Contains 35 galaxies.…
A: the Virgo cluster forms the heart of the larger Virgo supercluster that comprises approximately…
Q: The very first "image" of a black hole, at the centre of galaxy M87, was recently taken by the Event…
A: Given: The wavelength of the hydrogen line is λ = 21 cm The diameter of the earth is D = 12742 km…
Q: If a globular cluster contains 2 million stars and is 28 pc in diameter, what is the average…
A: This problem can be solved by first calculating the average volume reserved for one star and then…
Q: If you assume that a globular cluster 2 arc minutes in diameter is actually 19 pc in diameter, how…
A: Given, a globular disc cluster is 2 arc minutes in diameter. The actual diameter is d = 19 pc let D…
Q: Why must astronomers use infrared telescopes to observe the motions of stars around Sgr A*?
A: There is dust in the interstellar medium made of molecules and elements send out from the surface of…
Q: If the hottest star in the Carina Nebula has a surface temperature of 51,000 K, at what wavelength…
A: Concept: "The Wien's displacement law states that the wavelength carrying maximum energy is…
Q: Gas clouds that form stars are pulled together by which of the following?
A: The correct option is A : Gravitational Fields
Q: Because of interstellar dust, astronomers can see at most about 5 kpc into the disk of the galaxy at…
A: Stars create elements inside them through fusion. These will get slowly ejected as the star die.…
Q: Milky Way galaxy has about 5 x 10° solar masses of gas in total. If 13 solar masses of that gas is…
A: Thousands of stars, dust particles, and gas fill the Milky Way. Observing it from the top or bottom…
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Q: you assume that a globular cluster 4 arc minutes in diameter is actually 27 pc in diameter, how far…
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Q: A two-arm spiral density wave is moving through the Galactic disk. At the 8-kpc radius of the Sun's…
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Q: Please answer question 2 parts a, d, and e
A: Assuming the static equilibrium condition, which means that the block doesn't move, hence the…
Q: Why are interstellar lines so narrow?
A: Spectral lines are formed due to electrons making transitions between the energy levels inside the…
Q: why does the galaxy shown below have so much dust in its disk? How big do you suppose the halo of…
A: A halo is an extended, almost spherical component of a galaxy which extends beyond the main, visible…
Q: describe the characteristics of the various kinds of interstellar gas (HII regions, neutral hydrogen…
A: Star formation is generally more active in the denser, inner part of the Milky Way than in the outer…
Q: What temperature would interstellar dust have to have to radiate most strongly at 100 micro meter?
A: When stars die they will slowly send out their outer layers. This forms large clouds of dust and is…
Q: 13-4. The Sun is moving with speed 2.5 X 105 m/s in a circular orbit about the center of the Galaxy.…
A: Given data: speed of sun, v = 2.5 x 105 m/s To find: i) Time period…
Q: Assume that an average globular cluster is 25 pc in diameter. If you observe a galaxy that contains…
A: For the small angle, the approximation is, sin θ≅ tan θ ≅ θIf the angle θ is expressed in…
Q: If a protostellar disk is 210 AU in radius and the disk plus the forming star together contain 4…
A: The expression for the orbital speed of the outer edge is as follows: v=GMR
Q: (a) Rank the following components of the interstellar medium in order of the wavelengths at which…
A: (a). Components of the interstellar medium are detected due to the interaction between photons of…
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- Suppose you want to observe the molecular gas in a galaxy with redshift z using the rotational transition of CO J=4-3. What frequency would you observe this transition at? (Hint: the CO J=1-0 emits a photon at 115.27 GHz, and higher order transitions emit photons with frequencies in multiples of J. Express your answer as an integer. Values: z = 3.7If a standard passenger aircraft can fly at 0.37 km/s (828 mph), how long (in yr) would it take to reach the Sun? How long (in yr) would it take to reach the galactic center? (Note: 1 pc = 3.1 ✕ 1013 km. The radius of the Sun's orbit around the galactic center is approximately 8,300 pc.)If a standard passenger aircraft can fly at 0.26 km/s (582 mph), how long (in yr) would it take to reach the Sun? yr How long (in yr) would it take to reach the galactic center? (Note: 1 pc = 3.1 ✕ 1013 km. The radius of the Sun's orbit around the galactic center is approximately 8,300 pc.) yr
- If a galaxy has an apparent radial velocity of 2000 km/s and the Hubble constant is 70 km/s/Mpc, how far away is the galaxy?What evidence can you cite that our galaxy has a galactic corona?If the fastest passenger aircraft can fly 0.49 km/s (1,096 mph), how long would it take to reach the sun? How long would it take to reach the galactic center?
- if a protostellar disk is 260 au in radius and the disk plus the forming star together contain 7 solar masses what is the orbital speed at the outer edge of the disk in km per second. use the circular orbital velocity formulaWhat evidence can you cite that the interstellar medium contains both gas and dust? (Select all that apply.) (1)The dust of the interstellar medium can be detected from the emission lines of elements heavier than iron. (2)The dust of the interstellar medium can be detected by the extinction of light from distant stars. (3)The dust of the interstellar medium can be detected by the scattering of blue light from distant or embedded objects. (4)The gas of the interstellar medium can be detected from the radiation of ultraviolet photons. (5)The gas of the interstellar medium can be detected from the radiation of photons of wavelength 21 cm. (6)The gas of the interstellar medium can be detected from the absorption lines present in the light from distant stars, which must be caused by a medium of a density and temperature other than that of the stars emitting the light.Figure 2 shows the "rotation curve" of NGC 2742. It plots the “radial velocity (V)" (how fast material is moving either toward or away from us) that is measured for objects at different distances (R = radius") from the center of the galaxy. The center of the galaxy is at 0 kpc (kiloparsecs) with a speed of 9 km/sec away from us. (These velocities have been corrected for the observed tilt of the galaxy and represent true orbital velocities of the stars and gas.) 200 100 U4779 -100 As you can see, one side of the galaxy is moving with a negative velocity (spinning toward us), while the other side has a positive velocity (spinning away from us). Using Newton's gravity equation, we will be able to determine the gravitational mass of the entire galaxy and how the mass varies versus distance from the galaxy's center. -200 -8 8 -4 Radius (kpc) Read the following text carefully and follow the instructions: Select five radii spaced evenly from 0-10 kpc across the galaxy. Your selections should…
- If a giant molecular cloud has a diameter of 56 pc and drifts relative to nearby objects at 19 km/s, how long (in yr) does it take to travel a distance equal to its own diameter?What is messier 1 crab nebularIf a giant molecular cloud is 60 pc in diameter and a shock wave sweeps through at 25 km/s, how long will it take the shock wave (in years) to sweep through the cloud?