1.)answer is 1-stars in the bulge have nearly circular orbits and disk have nearly circular orbits
2.)collisions betwwen stars rarely occur while between gases frequently occur
3.) False-Gravity compresses lighter elements together, creating the heat and pressure that make fusion possible; however, by itself, gravity isn't an energy source
4.)False-galaxy contaisn asteroids other than stars and gas etc
Which of the following is true concerning the motions of stars in spiral galaxies: stars in...
Stars in elliptical galaxies move like the bulge or halo stars in spiral galaxies. a. Why can’t the rotation curve method to determine mass be used for elliptical galaxies? b. Masses of elliptical galaxies are often derived from their velocity dispersions. This part illustrates how a velocity dispersion can be determined: The intrinsic line-width of a K giant star might be 0.5 Å at a central wavelength λ0 = 5000 Å. Suppose an elliptical galaxy is observed which has a...
Jestion 6 Stars farther out in the disks of spiral galaxies seem to orbit the galaxy center faster than expected. This leads scientists to wonder if there may be a. Redshift b. Antimatter c. Dark energy d. Dark matter Moving to the next question prevents changes to this answer: 30 MacBook Pro FU 15 F7 % &
Which observation(s) is evidence that most of the stars, gas, and dust in our galaxy is in a thin disk? Select all that apply O Radio, X-ray,and gamma ray observations show gas in a band across the sky O Infrared observations show dust in a band across the sky O Individual stars appear in a band across the sky O Globular clusters appear in all directions on the sky Question 15 1pts Which observation(s) provide evidence that our galaxy formed...
3. Tremaine et al. (2002) have shown that supermassive black holes in the nuclei of galaxies follow a relation between black hole mass, MB, and the velocity dispersion of the host galaxy bulge component, σ, such that log,o MBH8.0+40logo 200km/ The gravitational radius, Ra. (in a sense the "sphere of influence") of a black hole can be defined by the distance from the center at which the orbital speed of a star due to the black hole alone (i.e. neglecting...
Which of the following statements about the force attracting these two galaxies is true? A) The force will get weaker as time passes. B) It is a mysterious force, whose nature remains completely unknown to scientists. C) It is a force unlike any force that we ever experience on Earth. D) It is the same force that causes an apple to fall to the ground.
Which of these characteristics are true of quasars, and which are false? True False Answer Bank associated with nearby stars very high redshifts associated with galaxies about as luminous as red giant stars stars with powerful radio emission powered by material traveling faster than light powered by nuclear fusion among the most energetic objects known powered by accretion onto a black hole A quasar is observed with a redshift of z = 3.9. What will be the wavelength of the...
Which of the following are true of both Robert Smithson’s Spiral Jetty and Serpent Mound made by Native Americans? A. They both use analytic line B. they both incorporate spirals, in fact, Smithson, inspired by the spirals of Serpent Mound, made his Jetty in a spiral C. both are earthworks that could be placed in any environment and retain the same meaning D. none of the above
Which of the following statements is true? O A. Stars that are further away always appear more dim than closer stars. B. The luminosity ('intrinsic brightness") of stars decreases with distance from the observer. C. The "colour" of a star is related to its distance. 0 D. The difference between the measured ("apparent") brightness of a star and its intrinsic brightness allows you to calculate its distance. Reset Selection Which of the following statements is true? O A. Stars that...
In recent years, scientists have discovered hundreds of planets orbiting other stars. Some of these planets are in orbits that are similar to that of earth, which orbits the sun (Msun = 1.99 × 1030 kg) at a distance of 1.50 × 1011 m, called 1 astronomical unit (1 au). Others have extreme orbits that are much different from anything in our solar system. The following problem relates to one of these planets that follows circular orbit around its star....
4) A binary star system consists of two stars, one of which is 1 solar mass and one of which is 2 solar masses. They are separated by a distance of 5 astronomical units and have approximately circular orbits. a) What is the orbital period of each star? b) What is the orbital velocity of each star? c) What is the angular momentum of the two star system, assuming that each star's radius is much smaller than its orbital radius?