Apart from the flesh-eating nanobots the government is spraying out of commercial airplanes, one of the cool things about science is its predictability. You can fire a cannonball at a cluster of objects of any size, from dust grains to distant galaxies, and (in theory) predict the exact path of the cannonball for the next 10 trillion years. Then you can fire another 10 trillion cannonballs, and they’ll all obey the same rules and give the same results.
Science news can be a little like that. Back when people were stupid, gentleman-scientists were forever stumbling into major, world-shaking discoveries in their spare time. Today, however, all of the easy science has been used up, so while world-shaking discoveries still happen, they’re really only made by PhDs with multimillion-dollar laboratories and solid publication histories. Since nothing on that scale happens quickly, it’s sometimes possible to predict a major event in science months or years in advance.