why do dark streaks appear in visible light images of the Trifid nebula, but appear bright in an infared image
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why do dark streaks appear in visible light images of the Trifid nebula, but appear bright in an infared image
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- You observe two randomly chosen stars 10,000 lightyears from Earth. One is in the disk of the Milky Way, the other in a direction perpendicular out of the disk. Compare the likely luminosity, doppler shift, metallicity, age, and color of these two stars.What are the two possibilities for the final state of a close, massive binary system?If a contracting protostar is two times the radius of the Sun and has a temperature of only 1890 K, how luminous will it be relative to the Sun?
- If an open cluster contains 350 stars and is 48 pc in diameter, what is the average distance between the stars? On average what, share of the volume of the cluster surrounds each star?if a protostellar disk is 260 au in radius and the disk plus the forming star together contain 7 solar masses what is the orbital speed at the outer edge of the disk in km per second. use the circular orbital velocity formulaWhy are emission nebulae red ?
- What kind of object is the Messier Object M42, and where is it in the sky?If a giant molecular cloud has a diameter of 56 pc and drifts relative to nearby objects at 19 km/s, how long (in yr) does it take to travel a distance equal to its own diameter?If a circular accretion disk around a 1.4 M, neutron star has a radius of 1.00 x 105 km as measured from the center of the neutron star to the edge of the disk, what is the orbital velocity (in km/s) of a gas particle located at its outer edge? (The mass of the Sun is GM 1.99 x 1030 kg. Hint: Use the circular orbit velocity formula, V, = ; make sure to express quantities in units of meters, kilograms, and seconds.) km/s