The Galactic halo contains as much gas and dust as the disk. (T/F)
Q: A globular cluster is located 4.57 kpc interior to the Sun's orbit and 7.93 kpc below the disk of…
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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: suppose a galaxy is What is the recessional velocity of this galaxy?
A: We have to evaluate the recessional velocity of the galaxy Speed of light = 3 x 108 m/s = 3 x 105…
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: 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: 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: 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: 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…
Q: A galaxy cluster has a recessional velocity of 19,000 km/s. Using the best estimate for Hubble's…
A: To calculate the distance of the distant galaxies in megaparsecs (Mpc) Hubble’s law is used. If the…
Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +15, how far…
A: The magnitude-distance formula be defined as, d=10mV-MV+55 Where, MV be defined as the absolute…
Q: If a galaxy has an apparent radial velocity of 4000 km/s and the Hubble constant is 70 km/s/Mpc, how…
A: Hubble's law states that galaxies move away from Earth with a velocity proportional to their…
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: If the active core of a galaxy contains a black hole of 106 M, what will the orbital period be for…
A: The expression for the orbital period, T=2πrv =2πrGMr =2πr32GM
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 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: If we plot the apparent brightnesses of stars in a globular cluster versus their surface…
A: Given, If we plot the apparent brightness of stars in a globular cluster versus their surface…
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…
Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +12, how far…
A: Given:The apparent magnitude of the supernova,mv=12Theabsolute magnitude of the supernova,Mv=-17Find…
Q: If active core of a galaxy contains a black hole of 10^6 M, what will the orbital period be for…
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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: If a galaxy has an apparent radial velocity of 2,319 km/s and the Hubble constant is 70 km/s/Mpc,…
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Q: ring galaxies often have nearby companions. What does that suggest?
A: The origin of ring galaxies is often debated. Some scientists believe that ring galaxies have formed…
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: If astronomers were to find they have made a mistake and our solar system is actually 7.8 (rather…
A: Let m be defined as the mass of the sun, and M be defined as the mass of the galaxy. Since the sun…
Q: how far away is the galaxy
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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…
Q: Given an image of a disk galaxy, you have measured that the average surface brightness at two radii…
A: Given that, The disk surface brightness profile has the exponential form of, I(R) = e^(–R/Rd)…
Q: Suppose you want to observe the molecular gas in a galaxy with redshift z using the rotational…
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Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +25, how far…
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