Use the Schwarzchild formula, Rs = 2GM/c2 , where Rs = Radius of the star, in meters, that would cause it to become a black hole M = Mass of the star, in kilograms, G = A constant, called the gravitational constant = 6.7 * 10-11m3/kg .s2, c = Speed of light = 3 * 108 meters per second. to determine to what length the radius of the Sun must be reduced for it to become a black hole. The Sun’s mass is approximately 2 * 1030 kilograms ?

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The search for black holes involves searching for   a. single stars that emit large numbers of X rays.   b. X ray binaries where the compact companion has a mass in excess of 3 M.   c. large spherical regions from which no light is detected.   d. pulsars with periods less than one millisecond.   e. pulsars that are orbited by planets.

The Schwarzschild radius of a certain black hole is 30n kilometers. The mass of this black hole, in units of solar masses, Mo, is given by M x aMo What is the value of a, if n = 5 (give only an integer value).

Black hole candidates are conspicuous by their continuous or flickering emission of   a. infrared light.   b. ultraviolet light.   c. gamma rays.   d. X rays.   e. all of the above.

Distances to the nearest stars (up to 500 ly away) can be measured by a technique called parallax, as shown in Figure 34.26. What are the angles θ and θ relative to the plane of the Earth’s orbit for a star 4.0 ly directlyabove the Sun?

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Show work. For the following: A parsec is a distance equal to 3.26 light years. The speed of light is 2.998 x 10°m/s. A nght year is a unit of distance equal to the distance light travels in one year. The brightest star in the night sky is Sirius, (Not the radio station) is 2.63 parsecs away. (1km30.621miles, 365d-1yr) How many miles away is this star?

What is the Schwarzschild radius of a star with a mass of z × 10 Mun? The answer is in 106m. So if you calculated an answer like 157,895,250 convert it like this: 106 157, 895, 250 × 157.9 and that is what you will input 100000 z =2.57 y =3 M Sun = 2 × 10³⁰ kg =

International Astronomical Union reported on 24 Feb 1987: An object was discovered on Feb. 24.37 UT (position R.A. = 5h35m.8, Decl. = -69 18'), obtained m = 4.8 on Feb. 24.454 UT. This object proved to be the most famous supernova (SN) in the 20th Century and the brightest visible from Earth since 1604. It is classified as a SN of the type Il in the Large Magellanic Cloud (SN1987A). Its brightness peaked in May 1987, with an apparent magnitude of m = 2.8. a) Find the absolute magnitude M of the SN1987A at maximum. Distance of the LMC is 51,400 pc. b) The progenitor (before SN explosion) star was a blue supergiant of the apparent magnitude m = 12.8. How much brighter (in terms of flux density) this SN was at maximum compared to the progenitor star. Find the ratio FSN / Ebefore