Why is this the answer?

The answer is sun because this clever riddle describes the most important star in our sky and how it takes care of all the planets. The sun is like the center of a big family called the solar system. All the planets that circle the sun are its "children." The first two lines, "My children are near and far. No matter that I know where they are," are talking about the planets. Some planets, like Mercury, are very close to the sun, which is the "near" child. Others, like Neptune, are super far away. The sun knows exactly where all its children are because of an invisible power called gravity. Gravity is the strong pull that keeps the planets spinning around the sun in their special paths, like being held on a leash. The line, "The gift I give them make their day," is talking about the sun's light and heat. That light is what gives us daytime here on Earth. Without the sun's light, our planet would be dark and cold, and nothing would be able to grow. The sun gives its energy to all the planets, making life on Earth possible. This gift makes every day a good day for us. The final line, "But if I were gone they would wander away," gives away the big secret. If the sun suddenly vanished, the gravity rope holding the planets would disappear, too. With nothing to hold them in their orbits, the planets would float away from their paths and tumble out into the darkness of deep space. They would truly "wander away" without their parent star to keep them close. This is why the sun is the perfect answer for this fun riddle.