If a very distant galaxy looks overall "blue" to astronomers, from this they can conclude that: O the galaxy must not be especially massive when compared to most galaxies O the galaxy must be composed mostly of very old stars O the galaxy is moving toward us at great speed O the galaxy must have had a personal tragedy of some sort and needs a lot of love O the galaxy must have a lot of young stars and thus active star formation must still be going in it

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: given: a (distance to center of galaxy in AU) = 1,717,914,439 AU P (suns orbital period in years)…

A: Given: a (distance to center of galaxy in AU) = 1,717,914,439 AU P (suns orbital period in years) =…

Q: If a galaxy has a redshift of 0.35 and the hydrogen line has a wavelength of 486.3 nm, what will be…

A: Redshift happens when the source of light moves away from the observer. The frequency observed will…

Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +15, how far…

A: The magnitude-distance formula be defined as, d=10mV-MV+55 Where, MV be defined as the absolute…

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: All Radio Galaxies have the following number of plasma jets and lobes a) 2  b) 5  c) 1  d) 4…

A: Radio galaxies have two plasma jets and lobes.

Q: a huge system of stats that has hundreds of millions to hundred of billions of stars that id…

A: In space hundreds of millions of stars Steller objects, dust , gas etc combine together a huge…

Q: What is the strongest piece of evidence for the existence of dark matter? O As stars die, they…

A: The strongest piece of evidence for the existence of the dark matter is "The orbital speed of the…

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

A:

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: If the active core of a galaxy contains a black hole of 10° Mo, what will the orbital period be for…

A: This problem can be solved using the formula for circular velocity and then dividing the distance by…

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

A: Required : Fill in the gaps.

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: State three differences between the elliptic galaxy and the spiral galaxy.

A: Elliptic galaxy : the shape of elliptical galaxies are like a spheroid, or we say elongated sphere.…

Q: What are the types of galaxies?

A: Required :   The types of galaxies.

Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +12, how far…

A: Given:The apparent magnitude of the supernova,mv=12Theabsolute magnitude of the supernova,Mv=-17Find…

Q: There exists an element visible in the spectrum of galaxies that shows the following spectra when…

A: Introduction: The Doppler effect refers to the apparent shift in the wavelength of a wave when there…

Q: If you find a galaxy that is the same size and mass as our Milky Way Galaxy, what orbital velocity…

A: Mass of our galaxy (M1): 4.0 X 1011 M Semi-major axis of the orbit (a): 51 kpc

Q: ___________ are generally expected to be found at the center of most galaxies. If large amounts of…

A:

Q: ring galaxies often have nearby companions. What does that suggest?

A: The origin of ring galaxies is often debated. Some scientists believe that ring galaxies have formed…

Q: 3 Billion Light-years 2 Billion 2 Billion Light-years Light-years 2.5 Billion 2.5 Billion…

A: Introduction: Hubble's law is the observation that galaxies are moving away from the Earth at speeds…

Q: If a galaxy contains a supernova that at its brightest has an apparent magnitude of +21, how far…

A: Apparent magnitude mV = + 21 Absolute magnitude MV = - 17

Q: 4) Calculate the redshift of a galaxy with a recessional velocity of 0.68c. (

A: When a celestial object is moving away from the observer the light observed from the object will…

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: how far away is the galaxy

A:

Q: Globular clusters revolve around the Galaxy in highly elliptical orbits. Where would you expect the…

A: A globular cluster is densely packed group of stars bound together by gravity. These clusters are…

Q: The gas in the outer region of the Andromeda galaxy is found to be orbiting the galaxy with a…

A: Given Velocity of gas = u = 250 km/s = 250000 m/s Radius of orbit from the center = r = 35kpc = 35 ×…

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.