A galaxy is a large grouping of stars. Approximately how many stars are in the Milky...
A galaxy is a large grouping of stars. Approximately how many stars are in the Milky Way galaxy?
A: 200,000 B: 200 million C: 200 billion
Which of the following best describes the sun at the present time?
A: it is a red giant B: it is a main sequence star C: it is a white dwarf
A unit used to measure the brightness of a star is:
A: an apparent magnitude B: mass C: eccentricity
the energy source for all-stars is a: A nuclear fission B: combustion
Homework Answers
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A galaxy is a large grouping of stars. Approximately how many
stars are in the Milky...
What is the reason for two stars to have the same brightness but one being 100...
What is the reason for two stars to have the same brightness but one being 100 times more luminous than the other? One of them is 100 times more distant One of them is 10 times more distant One of them is 1000 times more distant One of them is 4π times more distant The Brightness scale like the inverse of the square of the distance (1/R2) T F What is parallax? The distance of a star A method to...
1. Describe in few steps the formation of milky way galaxy 2. Give contrast between Normal galaxies and Active Galaxies. only) of galaxies. (Picture Only 4. Draw and explain the possible fat...
1. Describe in few steps the formation of milky way galaxy 2. Give contrast between Normal galaxies and Active Galaxies. only) of galaxies. (Picture Only 4. Draw and explain the possible fate of the universe. 9. Elucidate the stellar evolution of Sun 10. Draw HR diagram. Label the axis and locate the followings: Red giant, Red Supergiant, Blue Giant, Main sequence, White Dwarf. Extra credit: 10 Points Explain your ideas about blackhole. discuss what do you know about it, how...
choose correct answer. no explanation needed QUESTION 10 How do astrophysicists account for neutrino emission from...
choose correct answer. no explanation needed
QUESTION 10 How do astrophysicists account for neutrino emission from the Sun? Solar flares create neutrinos with very energetic magnetic fields. Convection releases neutrinos, which random walk through the radiation zone. Fission in the Sun's core creates neutrinos when protons turn into neutrons. The annihilation of positrons and electrons in the core produces neutrinos. Fusion in the Sun's core creates neutrinos when protons turn into neutrons, QUESTION 11 How does the interstellar medium impact...
2) Densities We discussed White Dwarfs and Neutron stars, very dense objects compared to stars like...
2) Densities We discussed White Dwarfs and Neutron stars, very dense objects compared to stars like our sun. On the other hand, we also discussed Red Giants which are much less dense than our sun. To realize just how dense, please compute the average densities (in kg/m) for a) the sun (Rsun=7 x 10 km, Msun= 2 x 1030 kg) b) when the sun becomes a red giant (R= 1AU, M=Msun). By what factor is a Red Giant less dense...
Astronomers have observed a small, massive object at the center of our Milky Way galaxy. A...
Astronomers have observed a small, massive object at the center of our Milky Way galaxy. A ring of material orbits this massive object; the ring has a diameter of about 10 light years and an orbital speed of about 210 km/s . A) Determine the mass of the massive object at the center of the Milky Way galaxy. Give your answer in kilograms. B) Give your answer in solar masses (one solar mass is the mass of the sun). C)...
1. When we observe very distant objects, we are observing a) objects about the age of...
1. When we observe very distant objects, we are observing a) objects about the age of the Milky Way b) objects of any age c) very young objects d) very old objects 2. After hydrogen, the most abundant element formed by the Big Bang was a) carbon b) helium c) deuterium d) oxygen e) iron 3. The expansion age of the universe is about a) 1 billion years b) 10 billion years c) 100 billion years d) 1000 billion years...
Please help!! 2) Approximately how many rain drops fall on a one-acre lot during a one...
Please help!!
2) Approximately how many rain drops fall on a one-acre lot during a one inch rain fall? Explain your reasoning and define any quantities you measure or estimated for your calculation. 3) The distance from the Sun to the nearest star is about 4x10^16m. The Milky Way galaxy is roughly a disk of diameter 10^21 m and thickness -10^19m. Find the order of magnitude of the number of stars in the Milky Way. Assume the distance between the...
A quasar has a brightness that corresponds to apparent magnitude 14.6 (Unit 55.4). a. If it is 1.29 billion pc away, how many times brighter than the Sun is it? The quasar is × 1011 times brighter tha...
A quasar has a brightness that corresponds to apparent magnitude 14.6 (Unit 55.4). a. If it is 1.29 billion pc away, how many times brighter than the Sun is it? The quasar is × 1011 times brighter than the Sun. b. How does this compare to the brightness of the Milky Way? Assume that the Milky Way contains about 1011 stars. The quasar is times brighter than the Milky Way.
30. Why are the Balmer lines in the spectra of giant stars narrower than those for...
30. Why are the Balmer lines in the spectra of giant stars narrower than those for main-sequence stars? 31. Binary stars are [common, very rare]. 32. Binary stars allow us to determine what very important property of stars? 33. In a binary system the center of mass lies closer to the [more massive, less massive] star. 34. What type of star is Sirius B? [main sequence, white dwarf, giant] 35. Why does a spectroscopic binary system only allow us to...
36. The Sun is primarily made of ___ hydrogen B) helium C) hydrogen and helium D)...
36. The Sun is primarily made of ___ hydrogen B) helium C) hydrogen and helium D) nitrogen 37. Blue is associated with_ wavelengths. A) long B) medium C) short D) red 38. Our Sun is . Aaverage in size B) larger than most stars C) smaller than most stars D) hotter than most stars 39. A_ is formed in a Supernova A) black dwarf B) white dwarf C) green giant D) black hole or neutron star 40. The center of...
1. Describe in few steps the formation of milky way galaxy 2. Give contrast between Normal galaxies and Active Galaxies. only) of galaxies. (Picture Only 4. Draw and explain the possible fate of the universe. 9. Elucidate the stellar evolution of Sun 10. Draw HR diagram. Label the axis and locate the followings: Red giant, Red Supergiant, Blue Giant, Main sequence, White Dwarf. Extra credit: 10 Points Explain your ideas about blackhole. discuss what do you know about it, how...
choose correct answer. no explanation needed
QUESTION 10 How do astrophysicists account for neutrino emission from the Sun? Solar flares create neutrinos with very energetic magnetic fields. Convection releases neutrinos, which random walk through the radiation zone. Fission in the Sun's core creates neutrinos when protons turn into neutrons. The annihilation of positrons and electrons in the core produces neutrinos. Fusion in the Sun's core creates neutrinos when protons turn into neutrons, QUESTION 11 How does the interstellar medium impact...
2) Densities We discussed White Dwarfs and Neutron stars, very dense objects compared to stars like our sun. On the other hand, we also discussed Red Giants which are much less dense than our sun. To realize just how dense, please compute the average densities (in kg/m) for a) the sun (Rsun=7 x 10 km, Msun= 2 x 1030 kg) b) when the sun becomes a red giant (R= 1AU, M=Msun). By what factor is a Red Giant less dense...
Please help!!
2) Approximately how many rain drops fall on a one-acre lot during a one inch rain fall? Explain your reasoning and define any quantities you measure or estimated for your calculation. 3) The distance from the Sun to the nearest star is about 4x10^16m. The Milky Way galaxy is roughly a disk of diameter 10^21 m and thickness -10^19m. Find the order of magnitude of the number of stars in the Milky Way. Assume the distance between the...
36. The Sun is primarily made of ___ hydrogen B) helium C) hydrogen and helium D) nitrogen 37. Blue is associated with_ wavelengths. A) long B) medium C) short D) red 38. Our Sun is . Aaverage in size B) larger than most stars C) smaller than most stars D) hotter than most stars 39. A_ is formed in a Supernova A) black dwarf B) white dwarf C) green giant D) black hole or neutron star 40. The center of...
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