Making Analogies
Great Bear : constellation :: Milky Way : _________
a. dwarf star
b. solar system
c. galaxy
d. nebula
Homework Answers
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)...
Which of the following correctly lists the distances in order of their size from smallest to...
Which of the following correctly lists the distances in order of their size from smallest to largest: A. Earth-Moon, Earth-Sun, distance across Local Group, distance across our Milky Way galaxy, distance across universe; Milky Way-Andromeda Galaxy, Sun-nearest star. B. Earth-Moon, Earth-Sun, Sun-nearest star, distance across our Milky Way galaxy, Milky Way-Andromeda Galaxy, distance across Local Group, distance across the universe. C. Distance across Local Group, distance across our Milky Way galaxy, distance across universe; Earth-Moon, Earth-Sun, Milky Way-Andromeda Galaxy, Sun-nearest...
Question 1) When does a protostar become a true star? Select one: a. when the star...
Question 1) When does a protostar become a true star? Select one: a. when the star is 1 million years old b. when the central temperature reaches 1 million Kelvin c. when nuclear fusion begins in the core d. when the thermal energy becomes trapped in the center Question 2: On average, what is the greatest mass a newborn star can have? Select one: a. 10 solar masses b. 50 solar masses c. 150 solar masses d. 300 solar masses...
Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0...
Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 x 1011 solar masses. A star orbiting near the galaxy's periphery is 5.7 x 104 light-years from its center. (a) What should the orbital period (in y) of that star be? 24.2e6 ху (b) If its period is 5.1 x 107 years instead, what is the mass (in solar masses) of the galaxy? Such calculations are used to imply the existence of other matter,...
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...
2. We are not alone Roughly how long would it take to count all the stars...
2. We are not alone Roughly how long would it take to count all the stars in the Milky Way Galaxy at a rate of one star per second? Answer in years using scientific notation. 4. What's that Angle? (a) The Orion Nebula is shown in the figure below. It is 1500 lightyears from Earth and about 30 lightyears across. Use this information to determine the angular diameter (angular size) of the Orion Nebula. Give your answer in degrees. (b)...
Astronomical observations of our Milky Way galaxy indicate that it center. (For your calculations, assume that...
Astronomical observations of our Milky Way galaxy indicate that it center. (For your calculations, assume that the galaxy's mass is concentrated near its center.) has a mass of about 8 × Ό11 solar masses. A star orbiting near the galaxy S periphery. S ,, e İ-lit ears or ts (a) What should the orbital period of that star be? yr If its period is 6.7 x ǐ07 years instead, what is the mass of the galaxy? Such calculations are used...
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 14 light-years and an orbital speed of about 100 km/s. A. Determine the mass M 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. Many...
Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8...
Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8 ✕ 1011 solar masses. A star orbiting near the galaxy's periphery is 5.6 ✕ 104 lightyears from its center. What should the orbital period (in y) of that star be? If its period is 5.9 ✕ 107 y instead, what is the mass (in solar masses) of the galaxy? Such calculations are used to imply the existence of "dark matter" in the universe and...
Astronomers treat the number of stars in a given volume of space as a Poisson random...
Astronomers treat the number of stars in a given volume of space as a Poisson random variable. The density in the Milky Way Galaxy in the vicinity of our solar system is ten stars per 16 cubic light-years. •What is the probability of at least one star in 5 cubic light-years? •How many stars would you expect there to be in 50 cubic light-years?
Astronomical observations of our Milky Way galaxy indicate that it has a mass of about 8.0 x 1011 solar masses. A star orbiting near the galaxy's periphery is 5.7 x 104 light-years from its center. (a) What should the orbital period (in y) of that star be? 24.2e6 ху (b) If its period is 5.1 x 107 years instead, what is the mass (in solar masses) of the galaxy? Such calculations are used to imply the existence of other matter,...
2. We are not alone Roughly how long would it take to count all the stars in the Milky Way Galaxy at a rate of one star per second? Answer in years using scientific notation. 4. What's that Angle? (a) The Orion Nebula is shown in the figure below. It is 1500 lightyears from Earth and about 30 lightyears across. Use this information to determine the angular diameter (angular size) of the Orion Nebula. Give your answer in degrees. (b)...
Astronomical observations of our Milky Way galaxy indicate that it center. (For your calculations, assume that the galaxy's mass is concentrated near its center.) has a mass of about 8 × Ό11 solar masses. A star orbiting near the galaxy S periphery. S ,, e İ-lit ears or ts (a) What should the orbital period of that star be? yr If its period is 6.7 x ǐ07 years instead, what is the mass of the galaxy? Such calculations are used...
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