What evidence shows that quasars are ultra-luminous but must be small?

Q: The cosmic microwave background consists of: huge clouds of dark matter interspersed with equally…

A: Cosmic microwave background also known relic radiation. Cosmic microwave background is kind of…

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: Describe a quasar.

A: Quasar is an extremely luminous active galactic nucleus. inside quasar there is a supermassive black…

Q: The objects that are detected at the points where the gas of a radio jet hits the extragalactic…

A: The quasar are small and the powerful source if energy that is active core of very distant galaxies.

Q: Astronomers now think that there is a black hole with more than 4 milliion times the mass of our Sun…

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Q: The Andromeda Galaxy is a member of the Local Group of galaxies. It is approaching us. Does this…

A: Given Andromeda galaxy is member of the local group of galaxies approaching us. Hubble law Hubble…

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: 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: The evidence leads modern astronomers to conclude that at the cores of active galaxies are…

A: Required : Mass of Supermassive Blackholes in terms of solar mass.

Q: a.) Galaxy B moves away from galaxy A at 0.521 times the speed of light. Galaxy C moves away from…

A: Given ( a )Galaxy B moves away from galaxy A at 0.521 times the speed of light Galaxy C moves away…

Q: Give the peak wavelengths, λpeak, for each of the following cases. State which portion of the…

A: Given,

Q: Now let’s determine when the universe “started its trip”. The distance is 800 Mpc, but first convert…

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Q: Explain how the Hubble constant, H0, can be used to make an estimate for the age of the Universe.…

A: Hubble's Law gives us the conclusion that the universe is always expanding.  It takes very short…

Q: Fourteen years ago, a quasar was found to be located 8 billion light years away. If the age of the…

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Q: Observations of quasars have shown us that many are extremely _________, emitting more energy than…

A: Required : Fill in the gaps.

Q: A certain galaxy is observed to be receding from the Sun at a rate of 8000 km/sec. The distance to…

A: According to the Hubble's law, the value of the Hubble constant is, v=HdH=vd Here, H is the Hubble's…

Q: Who won the Nobel Prize for discovering the cosmic background radiation?   a. Penzias and Wilson…

A: About discovering of cosmic background radiation .

Q: Does observed gravitational lensing correspond to a converging or diverging lens? Explain briefly.

A: Gravitational lensing: In this effect, the light rays bend towards massive objects in the space due…

Q: What is the mechanism for the energy output of quasars?

A: Quasars are high luminosity objects in the galaxy, having very high masses (ranging from millions to…

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

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Q: Is a quasar with a redshift of z = 2 going faster than the speed of light? Why or why not?

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Q: What would be the critical density of matter in the universe if the value of the Hubble constant…

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Q: An object is measured to be at a distance of 20 Megaparsecs away from Earth. Using a currently…

A: According to the Hubble's law, galaxies are moving away from Earth at speeds proportional to their…

Q: Explain how astronomers determined that the universe is expanding.

A: In universe there are millions of stars. These stars are always moving towards Earth or away from…

Q: How does Hubble’s Constant depend on time? How about distance? (In what sense is it constant?

A: Given: How does Hubble’s Constant depend on time? How about distance? (In what sense is it…

Q: When astronomers observe far away galaxies they see the light being redshifted (i.e. the frequency…

A: Red chief is a phenomenal when observed frequency of light of a source is less than the actual…

Q: when did the quasar emit the light that was observed?

A: Since, the quasar was found to be 8 billion light years away, the last light emitted by quasar was 8…

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: One interesting feature of quasars is that their energy output can change by great amounts in a…

A: we will someday know everything about our physical universe

Q: What do you mean by quasars?

A: The full form of QUASARS is Quasi Stellar radio sources.

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: How do we know the whole universe is expanding?

A: Given:-             The expansion of the universe is shows by Hubble by twentieth century was the…

Q: The farthest objects in our Universe discovered by modern astronomers are so distant that light…

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Stellar evolution

We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars do not exist forever they have a certain lifetime. The life span of the sun is about 10 billion years. The star undergoes various changes during its lifetime, this process is called stellar evolution. The structure of the sun-like star is shown below.

Red Shift

It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths (red) side.