why do you have to know the distance to a galaxy to find its mass?

Q: A star, which is 2.3 x 1020 m from the center of a galaxy, revolves around that center once every…

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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: Pls help ASAP. Pls show all work.

A: Given  r = 30 kpc Velocity curve To find out  Total mass of the galaxy ( estimated )

Q: A starburst galaxy produces only 50 new stars per year. (True or false)

A: A starburst galaxy is known for its high rate of star formation in comparison to the other galaxies.…

Q: What are the three main types of galaxies, and what are the peculiarities? What type is the Milky…

A: There are three main types of galaxies. They are, spiral galaxies, elliptical galaxies, and…

Q: Let us assume that our galaxy consists of 2.5 × 1011 stars each of one solar mass. How long will a…

A: Mass of the galaxy is

Q: how might you be misled if you studied only the brightest galaxies in a cluster?

A: There are some of the observations which may mislead if you studied only the brightest galaxies in…

Q: Explain how the temperature of hot gas can be used to find out about the gravitational pull of a…

A: Given: The hot gas temperature which is used to find the gravitational pull To find: The explanation…

Q: what is the difference between a Sa and a Sb galaxy? Between a SBb and a Sb?

A: Galaxy morphological classification is formed by the division of the galaxies into groups on the…

Q: which galaxies are poorest in gas and dust? Which have the fewest bright stars?

A: Elliptical galaxies contains primarily old stars and they do not have much gas and dust. The…

Q: propose an explanation for the lack of gas, dust, and young stars in elliptical galaxies.

A: The elliptical galaxies are old and dim galaxies. The stars in the elliptical galaxies give out red…

Q: If the active core of a galaxy contains a black hole of 10°M, (1 million solar masses), what will…

A: mass of black hole, M=106 MΘ=106*2*1030=2*1036 Kg radius of orbit,r=0.33 Au=0.33*1.5*1011=0.495*1011…

Q: Spiral Galaxy with 3 differences each and 2 similarities.

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Q: What type of galaxy does this picture represent? O Elliptical O Irregular O Spiral

A: The galaxy of the shape of an ellipse is known as an elliptical galaxy.

Q: why are the shells visible around some elliptical galaxies significant?

A: The shell structures in the elliptical galaxies indicates the extremely low surface brightness and…

Q: Which of the following is an accurate statement about quasars?

A: ANS: They are abnormally massive, luminous stars at the cores of ancient galaxies.

Q: What happens when galaxies collide? A. Star collisions will be rare but the shapes of the galaxies…

A: You are correct. The answer is A. A. Star collisions will be rare but the shapes of the galaxies…

Q: The Sun has an orbital speed of about 220 kms−1 around the centre of the Galaxy, whose distance is…

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Q: Which of the following might you expect to be an additional consequence of the fact that galaxies…

A: Given Which of the following might you expect to be an additional consequence of the fact that…

Q: An astronomer observed the motions of some galaxies. Based on his observations, he made the…

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Q: You observe a star orbiting in the outer parts of a galaxy. The distance to this galaxy is known,…

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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: The lower limit of the mass of the galaxy is a. 100 solar masses. b. 100,000 solar…

A: A lower mass limit is provided because of the timing argument.  The timing argument states that all…

Q: you will compare the balloon to our universe, with the dots / markings as galaxies or galaxy…

A: The balloon is compared to the universe and the dots are compared to the Galaxies, then When the…

Q: If a galaxy is 18 Mpc from Earth and the Hubble constant is 70 km/s/Mpc, what is the recession…

A: Answer:-  Answer (1)  Given  Distance (d) = 18 Mpc  Hubble constant (Ho) = 70 km/s/Mpc  Velocity of…

Q: Identify a feature of the Whirlpool Galaxy that is visible in all several types of light. Explain…

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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: What is formation and motion of galaxies?

A: Formation of galaxies:           Galaxies are collections of stars, gas, dust and dark matter held…

Q: Through the use of various measurement techniques, it has been found that most galaxies are rapidly…

A: Through the use of various measurement techniques, it has been found that most galaxies are rapidly…

Q: Astronomers observe several galaxies in the Local Group that actually approach the Milky Way. The…

A: Andromeda galaxy is the nearest galaxy to our Milky Way galaxy. It is approximately 2.5 million…

Q: When two galaxies collide, the stars inside them are not likely to be much affected, because the…

A: When two galaxies collide, the stars inside them are not likely to be much affected, because the…

Q: what evidence is there that galaxies contain dark matter? Supermassive black holes?

A: By the studies of rotation of galaxy, astronomers estimate that the 10% mass of galaxy is in the…

Q: Suppose you have obtained spectra of several galaxies and have measuerd the observed wavelength of…

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Q: What is the difference between an E7 and E0 galaxy?

A: Explanation: Elliptical galaxies have a very large range of sizes. Most of their stars are old and…

Q: The Hubble Law, equation (D), can be used to determine the age of the universe. Using your average…

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Q: what is the difference between an E0 galaxy and an E1 galaxy?

A: An elliptical galaxy has approximately ellipsoidal shape and a smooth, nearly featureless image.…

Q: Suppose you have obtained spectra of several galaxies and have measured the observed wavelength of…

A: Radial velocity

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.