The dark sun

When an object shows up in the sky and nobody knows what it is, NASA knows they should investigate. A space shuttle is sent into space and it is found that there is a large space rock that has gotten sucked into the moon's orbit. The rock doesn't seem like a problem until people notice that the days have been getting shorter and darker. NASA and the American government don't think they need to do anything until there is a report that the amount of sun that day was only 4 hours long. There is an investigation and it is found that the large rock had become stuck between the Earth's and the moon's gravitational pull and is blocking the sun. How will NASA get the space rock free so the Earth will have sun again. Until they do, no plants will grow, the cattle can't graze and people will become grumpy from lack of sun.