calculate how far away in miles Alpha Centauri would be in your model (model is attatched in image here)?

Listed below are several fictional stars with their luminosities and distances from Earth given. Rank the stars based on how bright each would appear in the sky as seen from Earth, from brightest to dimmest. using the formula  Lumionisty/4πd^2 A) Q-bert: L=400Lsun, d=40ly B) Frogger: L=400Lsun, d=20ly C) Centipede: L=200Lsun, d=10ly D) Galaga: L=100Lsun, d=8ly E) Pacman: L=200Lsun, d=20ly

Solution from part A: E=-KE = PE/2 Solution from part B: =3/2kt a. (NOTE: Treat the cloud as two equal masses interacting gravitationally across a distance equal to the radius of the cloud.) Use your result from part a to write down the condition for gravitational collapse in terms of the kinetic and potential energies (NOTE: This condition is an INEQUALITY)          b. Use your result from part b in order to replace the kinetic energy with its temperature equivalent in your expression for the collapse condition.          c. Solve the expression in ii above for the mass.

(Answer don't copy with hand written please)As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 12 times that of the Sun, but a surface temperature 0.5 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is A = 4πr2.

4 If a trillion (1012) asteroids, each 9 km in diameter, were assembled into one spherical body, how large (in km) would it be? (Note: The volume of a sphere km Compare that body's size to the size of Earth given in its celestial profile. d %3D dEarth Need Help? Read It