1.Average neutron star have 10 solar mass, and radius of 10 km. If all matter of star is from neutrons, and individual neutron magnetic moment are aligned.
Calculate magnetic dipole moment of star, and magnetic field on axis of rotation at point far from star?

2.The Most important image after Jupiter’s moons
Wide Field Camera 3 (WFC3) is the Hubble Space Telescope’s last and most technologically advanced instrument to take images in the visible spectrum. If single photon of light from 10% of stars from galaxy is necessary to form image and Hubble Space Telescope collecting are is 4.5 m2 . How long telescope need to monitor galaxy 13 billion light years away to form image. Average wave length of emitted light is 550 nm, number of stars in galaxy is 100 billion and power of one star on average 4.1 × 1026 W. ( light-year is the distance that light travels in a vacuum in one Julian year, exactly 9,460,730,472,580.8 km .
photon has a particular energy
E = h ƒ
h is Planck’s constant
h = 6.63 x 10-34 J s

3.If Sun power output is 4.1 × 1026 W (“Solar Data Analysis Center. NASA”), it is 150 million kilometers away from earth. The surface receives about 47% of the total solar energy that reaches the Earth. What surface area is required for installation of 1GW peak power ,solar electric power plant . Efficiency of solar power tower is about 30%.

un power output is 4.1 × 1026 W (“Solar Data Analysis Center. NASA”), it is 150 million kilometers away from earth. The surface receives about 47% of the total solar energy that reaches the Earth. What surface area is required for installation of 1GW peak power ,solar electric power plant . Efficiency of solar power tower is about 30%.

s the Hubble Space Telescope’s last and most technologically advanced instrument to take images in the visible spectrum. If single photon of light from 10% of stars from galaxy is necessary to form image and Hubble Space Telescope collecting are is 4.5 m2 . How long…