In which task is a camera the most useful? to measure the length of the leaves of a plant
to predict the star count over a broad area
to measure the thickness of different coins
to predict the number of people that live in a community

B, to predict star count

Explanation:

the rest can be done with rulers, Einstein cans and public surveys, we can't predict how many stars there will be, but we can take pictures of them instead

the largest known star in the universe is uy scuti, a hypergiant with a radius around 1,700 times larger than the sun.jul 26, 2018

explanation:

pe = weightxheight = 2000x1000=2,000,000joules