Why are interstellar lines so narrow?
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: What color is the center of this galaxy and why?
A: The supermassive black hole is the centre of the galaxy is located at inside the bright white patch…
Q: If interstellar dust makes an RR Lyrae variable star look 7 magnitudes fainter than the star should,…
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Q: Why are metals less abundant in older stars than in younger stars?
A: Answer: The metals which basically are non hydrogen and helium material are produced or created in…
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: bsorption lines produced by interstellar gas a. are wider than the lines from stars because the…
A: Introduction: The gas between stars is mostly hydrogen and helium scattered at varying densities…
Q: In the direction of a particular star cluster, interstellar extinction allows only 12% of a stars…
A: Given In the direction of a particular star cluster, interstellar extinction allows only 12% of a…
Q: The dust in a molecular cloud has a temperature of about 34 K. At what wavelength (in nm) does it…
A: temperature = T = 34 K wavelength = λmax=?
Q: What is the surface temperature of a star that emits at a peak wavelength of 400 non? 1nm=1x10(-9) m
A: The peak wavelength λmax=400nm = 400×10-9m
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: A typical dense core of an interstellar gas cloud has a diameter of 0.2 pc and a mass of 2 solar…
A: The diameter of the gas cloud is defined as 0.2 pc. Therefore, the radius of the gas cloud will be…
Q: igure 2: Left: A picture of a nearby galaxy taken with an ultraviolet telescope. Right: A picture of…
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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: 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: Now, rank the same objects by increasing temperature. For spherical objects, use the surface…
A: Intercloud gas: The gases other than intersteller gases present in space are known as intercloud…
Q: Stars formed after the Big Bang had cooled down. From globular cluster dating and from stellar…
A: All of the matter and energy in the universe was once confined to a singularity with infinite…
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: Consider two different clusters with approximately the same turnoff luminosity. Cluster A has a main…
A: Given two clusters A and B on the H-R diagram (which is a plot between the luminosity and…
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: What kinds of objects lie in the halo of a spiral galaxy?
A: Given :- Spiral galaxy and what kinds of objects lie in the halo of it.
Q: Gas clouds that form stars are pulled together by which of the following?
A: The correct option is A : Gravitational Fields
Q: If an open cluster contains 450 stars and is 21 pc in diameter, what is the average distance between…
A: Given Number of stars in an open cluster (n) = 450 Diameter of the cluster Dclu = 21 pc…
Q: If a globular cluster contains 2 million stars and is 30 pc in diameter, what is the average…
A: A Globular cluster is a cluster of old stars, only a few years younger than the Universe itself…
Q: The figure below shows the spectra of two galaxies A and B.
A: 1. According to the figure Galaxy A has a high relative flux density which shows it has a dense…
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: Hotter, more massive stars are virtually absent from globular clusters. What does this tell us?…
A: Globular clusters are clusters of stars, that are nearly symmetrical and round shaped clusters.…
Q: What part did globular clusters play in the determination of the size and shape of the Milky Way?
A: Globular Clusters: These are nothing but a group of stars which are strongly bounded by the gravity.…
Q: An astronomer is observing a binary star that is 15 pc away. The two stars have an orbital…
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Q: Two identical stars are moving in a circular orbit around one another, with an orbital separation of…
A: An orbital separation of two identical stars, s=2 AU=2 AU×1.5×1011 m1 AU=3×1011 m The distance of…
Q: The H-R diagram is the most important graph in astronomy. One of the reasons that this graph is so…
A: The H-R diagram is an important tool to study about stars and related information which we could…
Q: A scientist, using a telescope, sees arcs of light around a galaxy. In 3–5 sentences, explain the…
A: Answer:- A scientist, using a telescope, sees arcs of light around a galaxy. The arcs of light…
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 are the on the axes of a Hertzsprung-Russell diagram? (b) Name one thing you can tell about a…
A: Hertzsprung-Russell Diagram plots the temperature of the start against their luminosity (or) colour…
Q: Some interstellar Properties. Use excel calculator to fill in the missing figures. 1 ly = 365 × 24 ×…
A: A Table of a list of stars is given with their masses (given in solar masses) and distance to the…
Q: You observe two randomly chosen stars 10,000 lightyears from Earth. One is in the disk of the Milky…
A: In this question we have to observe two randomly chosen stars 10,000 lightyears from Earth. One is…
Q: The Orion Nebula is about 20 light-years (20 × 1018 cm) across, enclosing a roughly spherical area…
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Q: describe how the 21-cm line of hydrogen is formed. Why is this line such an important tool for…
A: In space almost all of the hydrogen atoms are in ground state. The electron moves around the proton…
Q: If the RR lyrae stars in a globular cluster have average apparent magnitudes of +15, how far away…
A: The apparent magnitude (mv) of the given star is 15. The absolute magnitude (Mv) of a given star is…
Q: The RR Lyrae stars in a globular cluster have apparent magnitudes of 14. Assuming an absolute visual…
A: Given that the apparent magnitude mv=14 and the absolute visual magnitude Mv=0.5, substituting…
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