If the active core of a galaxy contains a black hole of 106 MSun , what will the orbital distance be (in km) for matter orbiting the black hole with an orbital period of 1 hour?

Q: e gravitational energy of a pair of colliding galaxies , each of mass 10 Mo separated by a distance…

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Q: A Type la supernova explodes in a galaxy at a distance of 6.10×107 light-years from Earth. If…

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Q: how do deep images by the Hubble Space Telescope confirm the bottom-up theory of galaxy formation?

A: The bottom up model, also known as Hierarchal Clustering s the most accepted way for galaxy…

Q: If a group of galaxies is revolving around its center at 240 miles/sec how fast is it moving in…

A: Let the galaxy's speed be denoted by v. The speed of the galaxies is 240 miles per second.

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: 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: What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…

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Q: A galaxy is 30 Mpc away from us and has a recession velocity of 2000 km.s-1 . What is Hubble’s…

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Q: What is the recession speed of a galaxy cluster which is 50Mpc away from Earth? Is the light from…

A: Hubble Law It state that distant galaxies are moving away from our earth with a recession…

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: Let's say that the number density of galaxies in the universe is, on average, 3 × 10–68 galaxies/m3.…

A: Given :number density of galaxies, n = 3 × 10–68 galaxies/m3            Observable distance by…

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: Recall that Hubbleʹs law is written v = H0d, where v is the recession velocity of a galaxy located a…

A: Data provided: H0 = 80 km/Mpc Distance (d) = 800 Mpc Required: Velocity of the galaxy (v)

Q: the sun has an orbital speed of about 220kms^-1 around the centre of the galaxy , whose distance is…

A: orbital speed of sun = 220 kms= 220000 msdistance = 28000 light years

Q: Observations of the central region of the galaxy M87 indicate that stars which are 60 light years…

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Q: Suppose you measure the radial velocity of a galaxy to be 5,000 km/s. How far away is it

A: The formula for the distance is d=vH0

Q: How would our knowledge about galaxies be altered if we didn't have telescopes? Justify your answer.

A: If we did not have telescopes, it would be impossible to see other galaxies by naked eye, hence we…

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: If a galaxy is 100,000,000 parces away and has absolute magnitude of -20.0 what is the galaxies…

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Q: A star at a distance of 50000 light years from the center of a galaxy has an orbital speed of 100…

A: Distance of the star from the center of the galaxy, r = 50000 ly The orbital speed of the star, v =…

Q: Pretend that galaxies are spaced evenly, 7.0 Mpc apart, and the average mass of a galaxy is 1.0 ✕…

A: The average density of matter in the universe is given by

Q: Is the NGC 4440 galaxy observable from the Calar Alto Observatory?

A: Calar Alto Observatory Calar Alto, a 2,168-meter-high (7,113-foot) mountain in the Sierra de Los…

Q: A star near the visible edge of a galaxy travels in a uniform circular orbit. It is 43,500 ly…

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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: 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: A galaxy's velocity is measured to be 3112 kilometers per second away from us. What is the distance…

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Q: how long do long-exposure photos of two selected areas of the sky reveal that galaxies are very…

A: In photography exposure means amount of light per unit area reaching the photographic filim or…

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

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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: A galaxy is observed to recede at speed 140 km/s. If the Hubble constant is 70 km/s/ Mpc, how far is…

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Q: If astronomers find they have made a mistake and our Solar System is actually 7,350 pc rather than…

A: In the given question, We have to determine the mass of the galaxy within the orbit of the sun.

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

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Q: If a galaxy has a radial velocity of 21,641 km/s, what is its expected distance from the Hubble Law?…

A: Given data :  Radial velocity of galaxy (V) = 21,641 km/s Humble constant (Ho) = 71 km/s/Mpc…

Q: What is the total mass of the Milky Way Galaxy?

A: The total mass of  milkyway galaxy is around 700 billion solar masses.

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.