Question

in 2009, the kepler space telescope was sent to space to search for planets near our solar system. the telescope found about 960 planets. in 2013, however, there was a problem with keplers steering system. scientists on earth couldnt steer the telescope. they worried that they wouldnt be able to fix the kepler telescope. then scientists found another way to steer kepler using the power of the sun. light from the sun acted as a force pushing on the telescope. that force was enough to keep the telescope in place. what is the main, or central, idea of the passage? scientists came up with a new way to steer the kepler space telescope after it developed a problem. the new steering system on the kepler space telescope used light from the sun to keep it in place. when it was first sent to space, the kepler space telescope discovered over nine hundred planets.

Explanation:

The passage first mentions the Kepler space telescope's mission and initial discovery. Then it focuses on the 2013 problem with its steering system. The key part is scientists finding a new way (using sunlight as a force) to steer it. The first option encompasses the problem - solution structure which is the main idea. The second option is just a detail of the new method. The third option is an initial fact but not the main idea.

Answer:

Scientists came up with a new way to steer the Kepler space telescope after it developed a problem.