Some astronomers have theorized that galaxies (matter) and antigalaxies (antimatter) have existed. Each galaxy contains about 1011 masses of the Sun. Calculate the total energy released if a matter-antimatter galaxy pair annihilated. The mass of the Sun is 1.9 × 1030 kg and the speed of light is 3 × 108 m/s. 1. 3.42e+58 2. 3.42e+58 3. 3.42e+58 4. 3.42e+58 5. 3.42e+58 6. 3.42e+58 7. 3.42e+58 8. 3.42e+58 9. 3.42e+58 10. 3.42e+58 Answer in units of J.

3.42e+58J

Explanation:

Energy E=mc^2

C=speed of light=3*10^8

m=mass

Note that each planet contains 10^11 masses of the sun.

Energy released = (10^11*1.9*10^30)*(3*10^8)^2

Therefore, Energy released by the matter=1.71*10^58

And the energy released by the antimatter is also 1.71*10^58

Therefore total energy released by both matter and antimatter= (1.71+1.71)*10^58

=3.42e+58J

answer; i believe that the correct answer is (the explosion of a nearby star(supernova);

hi there!

question - how does mountainous terrain affect settlements in a region? choose all answers that are correct.

groups trade with each other regularly.

people travel from settlement to settlement.

why: since they travel to go trade or visit it may be harder to get there because of the mountainous terrain.

hope this : )