In the direction of a particular star cluster, interstellar extinction allows only 12% of a stars light to pass through each kiloparsec ( 1000 pc) of the interstellar medium. If the star cluster is 4.0 kiloparsecs away , what percentage of its photons survive the trip to Earth?

Q: Star A and Star B are both on the main sequence. Star A is 74 times more luminous than Star B. What…

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Q: Consider a disk with disk temperature T = T0(r/AU)−1 with T0 = 200K.and surface density given by Σ =…

A: The objective of this question is to find the difference between the orbital speed of the gas at 1…

Q: An astronomer is observing a binary star that is 15 pc away. The two stars have an orbital…

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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: A giant molecular cloud is 30 pc in diameter and has a density of 339 hydrogen molecules/cm^3. What…

A: Concept used: Mass is found by multiplying by density and volume of sphere.

Q: A molecular cloud is 22 pc in diameter and is located 303 pc from Earth. What is its angular size on…

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Q: This star has a mass of 3.3 MSun. What is the main sequence lifetime of this star? You may assume…

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Q: You observe a spectral line from an emission nebula at a wavelength of 723 x 10-9 m.  If you are…

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Q: At the average density of a star-forming molecular cloud, about 900 atoms per cm3, determine how…

A: Given:- M=2 times 1030 kg density=900 atoms/cm3= 1.51 times 10-18 kg/m3 Find radius of the sphere…

Q: dP dr GM(r)p(r) p2

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Q: a star converted every bit of its mass into energy the conversion efficiency would be 100%. However,…

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Q: If interstellar dust makes an RR Lyrae variable star look 5 magnitude fainter than the star should,…

A: Given the magnitude get fainter by 5. Therefore,

Q: If the RR Lyrae stars in a globular cluster have average apparent magnitudes of +19, how far away…

A: From the figure, absolute magnitude of RR Lyrae star is 0.75. Using the Magnitude-Distance formula,…

Q: Interstellar extinction dims starlight by about 1 magnitude per 1000 pc. What fraction of photons…

A: The apparent visual magnitude of star is changed by 1 magnitude, produces a flux ratio of fifth…

Q: Describe the relationship between the concept of hydrostatic equilibrium and the interior structure…

A: On each and every star in the astrophysics, there are always two forces acting. The first force is…

Q: When two stars are in the same star system, they can affect each other’s evolution. Two stars in the…

A: Two stars in the same system might evolve at a different pace, depending on their distances in the…

Q: Even though neutral hydrogen is the most abundant element in interstellar matter, it was detected…

A: Interstellar matter is the matter that exists in the space between the stars. It is mostly comprised…

Q: A giant molecular cloud is 30 pc in diameter and has a density of 330 hydrogen molecules/cm^3. What…

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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: Observations show that the gas ejected from SN 1987A is moving at about 10,000 km/s. How long will…

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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: An astronomer is observing a binary star that is 15 pc15 pc away. The two stars have an orbital…

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Q: The disk of the Milky Way galaxy contains roughly 200 billion (1 billion = 109 ) stars. The disk is…

A: The milky way galaxy consists of a disk of about 100000 ly diameter and a thickness of about 1000 ly…

Q: The ring around SN 1987A (see the figures below) initially became illuminated when energetic photons…

A: To calculate how long after the supernova SN 1987A the ring became illuminated, we need to consider…

Q: At the average density of of a star-forming molecular cloud, about 1180 atoms per cm3, determine how…

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Q: suppose a planetary nebula is 2.8 pc in diameter, and doppler shifts in its spectrum show that the…

A: Given information: The diameter of the nebula (D) = 2.8 pc = 2.8 (3.1×1013 km) = 8.68 ×1013 km The…

Q: planetary nebula expands at 38 km/s. How far will it expand (in km) in 3 million years?

A: Here given nebula is expanding with given speed. As in 1 sec nebula expands 38 Km, In 3 million…

Q: A planetary nebula expands at 32 km/s. How far will it expand (in km) in 0.6 million years?

A: Expansion rate of the Nebula: It can be defined as the distance up to which the nebula expands in a…

Q: 2. A solar-type star is seen with an apparent magnitude my = 30. Assuming that there is no…

A: As we know that,The distance modulus is a common technique of measuring distances in astronomy. It…

Q: Select all of the statements about the main sequence stage in the life of a star that are TRUE:…

A: The statements about the main sequence stage in the life of a star that are TRUE: All stars spend…

Q: As a cluster of stars begins to age, which type of star in the cluster will move off the main…

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Q: What determines the mass distribution of forming stars, the initial mass function (IMF

A: Stars are formed when gas, giant clouds, dust etc. present abundantly in space come together due to…

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: Assuming a mass loss rate of 3*10^-8 solar masses yr^-1 and a stellar wind velocity of 100 km s^-1…

A: Required :  Mass density at the 100 AU

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…