15) Astronomers discover a new astro in the Pisces constellation 48 times as mas
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15) Astronomers discover a new astro in the Pisces constellation 48 times as massive as planet Jupiter. The spectrum of this object shows that it's not a nebula (not a diffuse cloud of gas). What might it be? a) An asteroid b) A brown dwarf c) Anew star d) A planet e) A galaxy 16) Two main sequence stars (04 and G3 spectral types) eclipse each other in a binary system. Explain the two different dips observed in the light curve of the system resulting from the two stars passing in front of one another. 17) How could you determine the distance to a) a nearby star? c) a galaxy using Cepheids? b) any star in our galaxy? 18) According to Chandrasekhar's limit, the final fate of a star with a mass of 1.3 solar masses will be a: a) White dwarf b) Neutron star c) Black hole d) MS star e) Nova 19) Describe the steady state model of the universe. 20) What are the three observational proofs in support of the Big Bang theory discussed in class? 21) All stars visible from Earth to the naked eye belong to the... a)Galactic center b) Solar system c) Milky Way d) Andromeda galaxy e) None of the above 22) The absolute magnitudes of three main sequence stars are M 3, M-0 and M-5. Which star is the reddest? a) Star with M-0 b) Star with M-3 c) Star with M-5 d) It depends on the star's shape e) None of the aboveExplanation / Answer
answer-
15. d. a planet.
17. a. nearby stars are measured using the method parallax.
b. the stars' apparent motion is called stellar parallax.the distance D is measured in parsecs and the parallel angle p is measured in arc seconds.
c. for distant galaxies ,astonomers rely on the exploding stars known as supernovae.like the cepheids ,the rate at which a certain class of supernovae brightens and fade reveals their true brightness ,which can be used to calculate their distance.
18. white dwarf .
it will be a supernova after it exceeds the limtis of 1.3 solar masses.
19. the steady state theory is a view that the universe is always expanding but maintaining a constant average density matter being continuously created to form new stars and galaxies at the same rate that old ones become unobservable asa consequence of their increasing distance and velocity of recession.A steady state universe has no beginning or end in time and from any point within it the view on the grand scale i.e. the average density and arrangement of galaxies -is the same.galaxies of all possible ages are intermingled.
21. c. milky way.
22. M=0.
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